Database Users

[GUIDE] How to unbrick Acer Iconia A500

I just got from a friend an Acer Iconia a500 he says that is bricked.
I tried this method: http://forum.xda-developers.com/showthread.php?t=1572622
But I can't continue because I don't have ADB access, what should I do?.
Thanks for all and God bless you.
EDIT:
I got everything to using the secret APX mode, but now is still everything the same the Android System is still there and not charging and not touchscreen...
Go to the bottom to see how I solved this lol...
Click to expand...
Click to collapse
If your tablet Iconia 500 (ONLY ACER ICONIA A500) went crazy, and present the next symptoms (Yes it has flu...):
-flu
-Android System icon
-Doesn't want to charge (20% / 15% 12%).
-TouchScreen is not responsive.
-Always when you turn it on says Shutting down and never shuts down.
-In case you're using ICS shuts down immediately without even make you see.​
The solution is the next!:
1. Download this file: http://www.4shared.com/archive/zyP91E0C/root-321-V4.html (This is the file to put recovery in case that you don't have it).
2. Extract all the files in any folder, it doesn't matter where you put it.
3. Go to Image Folder and rename the recovery to: anyname.img.
4. Download any of the lastest recoveries for Acer Iconia a500 (it will work believe me lol).
5. Put the recovery in the Image folder (Ex. Iconia/root-3.2.1/Image/) and rename it to recovery.img
6. Now open with Administrator Rights DotNetDetecter.exe
7. Continue, continue and continue.
8. If you have ADB Active just put it and it will install it. (If you don't have it just go to 8.1)
8.1 Shut down the tablet completly, connect your USB Cable *micro* (Tablet-Computer), take a paper clip and put it on reset without release it then press the power button and count until 4 or u4ntil you hear the sound when you plug something into Windows
8.2 Now your tablet is in APX Mode and the Acer Utility should now work.
9. Put your UID with a 0 in front of all the numbers (if you don't have it go to secret step).
10. Now let everything work. After everything is done you should have recovery now.
11. Press down volume and the tablet will take you to the recovery.
12. Download some ROM 3.2 or ICS 4.0.3, install it via recovery.
13. Download this file: http://www.mediafire.com/?9svnvdk982sxrw4
14. Install the version you have choosen via Recovery.
15. Voila! Your tablet is revived right now
Press thanks button if this helped you =D
SECRET STEP TO GET UID (IS NOT SECRET THOUGH... lol)
Just go to USB tools and use USBdeview, and is done... (Remember to stay in APX Mode)
CREDITS:
-Fguy on www.4pda.ru (EC_FLASH FILES)
-timmyDean on XDA (Root-3.2.1-V4 FILES)
-Moscow Desire (XDA Member, if it wasn't for him it couldn't get to see the light)

thanks for the great guide but could you point me in the right direction for the lastest recoveries for Acer Iconia a500 as the links i find dont work
thanks in advance
matthew

mjfaderway said:
thanks for the great guide but could you point me in the right direction for the lastest recoveries for Acer Iconia a500 as the links i find dont work
thanks in advance
matthew
Click to expand...
Click to collapse
Acer Recovery from the Market should have the most recent RA Recovery, and the original GPL compliant CWM recovery.
Or if you already have the original CWM, you can get the most recent RA Recovery here. Just check the threads for the flash files.
http://forum.xda-developers.com/showthread.php?t=1459821
For CWM you will need to go to tegraowners.

Dear Sir
I have same problem with my tablet too for 4 months and I explained that HERE or HERE
and i followed all instruction in these 2 threads
http://forum.xda-developers.com/showthread.php?t=1572622
http://forum.xda-developers.com/showthread.php?p=24531880#post24531880
and I used from ECrom files created by Mr. Fguy ver 4.03-22 and 3.2.1 but my problem is Lasting yet
can you help me?
you had same problem and you know how bad is a bricked tablet in your hands
thank you and GOD bless all of you
[email protected]
[email protected]

darvis said:
Dear Sir
I have same problem with my tablet too for 4 months and I explained that HERE or HERE
and i followed all instruction in these 2 threads
http://forum.xda-developers.com/showthread.php?t=1572622
http://forum.xda-developers.com/showthread.php?p=24531880#post24531880
and I used from ECrom files created by Mr. Fguy ver 4.03-22 and 3.2.1 but my problem is Lasting yet
can you help me?
you had same problem and you know how bad is a bricked tablet in your hands
thank you and GOD bless all of you
[email protected]
[email protected]
Click to expand...
Click to collapse
I don't have the tablet anymore, it was a friend one, I can help you with your big problem because really it was easier than I thought, you can PM me with all the details, and yes the flu is a big problem... =P

Problems with opening up settings to turn on usb debugging
Hi Travisantonio,
I have a question:
Did you have any problems opening up the settings when you were on the black "android system" screen?
My touch screen is completely unresponsive at the moment.

Maybe I didnt read or understand everything but with my tab USB view didnt give me my ID or it wouldnt work. Got into ADX mode but couldnt get things working. Tried ADB to list devices and would never list anything. I heard my computer beep when I would hook it up but couldnt really do or complete anything. I couldnt get the DOTNETDETECTOR (PBJUPRADE_ to work. Tried A500 APX flash utitlity. Tired nvflash and falied. Guess I should list more information but at this point I tried so many things to recover dont remember the order I did things. I originally tried to upgrade to a Rom but all things failed and actually not sure what ever got completed. Only thing I could tell my tab did besides black screen was the power button either was white(some type of one) or orange.

This helped me to recover my bricked Acer 500 tablet after a failed ICS upgrade. The Acer update seemed to go okay, but on reboot it froze at the Acer logo and had an error in the corner. Every reboot or button/reset resulted in this. It would not recover or do anything else. I was able to get the USB device ID /serial number using the USB deview 64 program in the usb folder. There were several entries for the tablet but only one had a usable number (bottom right line at the end). Then the tool wiped the tablet and reloaded 3.2.1 and booted to factory new. Thanks for the instructions and to all the other XDA-ers for the tools. I am now on ICS properly.

Trying to recover a bricked acer a500, I just have a black screen on boot with no boot logo, vibration or letters or words on the screen
trying to enter recovery/update mode doesnt work
Im up to the step where is says put in your UID into the program
Just go to USB tools and use USBdeview, and is done...
Click to expand...
Click to collapse
I did this and found the device but where exactly is the UID located?
looking at other threads, the serial number is the UID however the serial number entry is blank for this device

Joey22688 said:
Trying to recover a bricked acer a500, I just have a black screen on boot with no boot logo, vibration or letters or words on the screen
trying to enter recovery/update mode doesnt work
Im up to the step where is says put in your UID into the program
I did this and found the device but where exactly is the UID located?
looking at other threads, the serial number is the UID however the serial number entry is blank for this device
Click to expand...
Click to collapse
this method is total overkill for your situation....
how did u get yr tab like this???
if u have total black screen - is the power button lite on?????
what bootloader version are u on
have you had a custom recovery on there
to get your cpuid follow the first link to a guide in my signature - you need to follow steps in the guide if you have any probs then post in the guide thread

the previous owner said he tried to install a custom rom and I think it crashed and this is the result
the power light turns on (white)
if I just power it on, the backlight turns on however its just a black screen, nothing else happens
apx mode seems to be the only thing working right now, I thought this method would be my only chance to get the recovery mode working again
I dont know anything else about the tablet, bootloader ect...

Joey22688 said:
the previous owner said he tried to install a custom rom and I think it crashed and this is the result
the power light turns on (white)
if I just power it on, the backlight turns on however its just a black screen, nothing else happens
apx mode seems to be the only thing working right now, I thought this method would be my only chance to get the recovery mode working again
I dont know anything else about the tablet, bootloader ect...
Click to expand...
Click to collapse
ok thats cool, apx mode works!!!
well try this first - using hard reset:
1) Turn off your tablet,
2) Rotation lock on your left;
3) Press Vol Up closest to rotation lock and power on simultaneously
4) As soon as the tablet vibrates you can release the power button and you should start to switch rotation lock left and right till you see
Erasing Userdata...
Erasing Cache...
Vol Up is still pressed;
5) The tablet starts to format
6) Your tablet will be as clean as it can be.
otherwise plan B!!!
do u know whether tab was running HC or ICS?
u need some package files and a flash tool either apxflash or nvflash
if u start the tools and then connect your tab via usb cable to your pc
there are links to guides in my sig
my cpuid guide shows u what u need and where to get it, info about your cpuid too and drivers - altho you wont need to worry too much seeing as youre in apx
civatos guide has all the links to the packages and all the info you need to patch the bootloader, then you can flash one of the ics roms and youre all good!!!
the process is simple enough - but if you get it wrong it can be frustrating as heck!!!!

tried that method, get no vibration, devices just turns on to the black screen like normal
the only problem right now, I cant retrieve the uid
adb
when I type adb devices, nothing shows up
A500 manager
tried to the use the uid retriever tool however it just stays blank, same for the bootloader
it says it detects the A500 in apx mode
usbdevice view
shows no serial number for this device
I see there is a A500 motherboard on ebay (cant link to outside links...)
"Acer Iconia A500 Tablet Replacement Parts - MainBoard - 32GB MB, H6000 001 PBJ20"
"Complete with Android 4.x installed, 32GB memory and ready to install and boot."
could I get that and just replace the whole mobo and it will work fine?

Joey22688 said:
tried that method, get no vibration, devices just turns on to the black screen like normal
the only problem right now, I cant retrieve the uid
Click to expand...
Click to collapse
OK just clarify - black screen, that is, nothing at all displayed AND Power Light ON??
IF u r in apx mode then
U have a couple of options
EUU flash back to HC 3.2.1 or
apxFlash to ICS
Everything you need for doing this is in my cpuid guide link in my sig.
open apxflash tool do not connect your tab Yet
Go as far as the enter apx mode
Now connect your tab to yr pc
Windows should install apx drivers
Once installed. try clicking blue arrow first
If u don't see the do u want to flash window then
You'll need to click on the "enter apx mode " button instead then
Click blue arrow
Hopefully the PC and tab are feeling pretty friendly and decide to take each other on
The tab should flash the bl and install recovery.....u should be good to go from there!!!
EDIT you can try cmd prompt on nvflash folder
Run a500.bat or.bat file that should kick you to bootloader mode
its really important that your screen display something in white letters!!
Entering Acer download mode OR
Entering apx mode
The flash will fail if u don't see something like this. This holds true for all methods
I see there is a A500 motherboard on ebay (cant link to outside links...)
"Acer Iconia A500 Tablet Replacement Parts - MainBoard - 32GB MB, H6000 001 PBJ20"
"Complete with Android 4.x installed, 32GB memory and ready to install and boot."
could I get that and just replace the whole mobo and it will work fine?
Click to expand...
Click to collapse
Wayyyy outta my league m8. Sum1 else will know....

yes, its just a black screen, no vibration, no boot logo, no letters or words on the screen, backlighting for the screen is on, and the power light is on
when I press the blue arrow in a500 apx flash tool it asks me for my SBK, going to that generator site it then asks for my UID which I cant retrieve

Joey22688 said:
yes, its just a black screen, no vibration, no boot logo, no letters or words on the screen, backlighting for the screen is on, and the power light is on
when I press the blue arrow in a500 apx flash tool it asks me for my SBK, going to that generator site it then asks for my UID which I cant retrieve
Click to expand...
Click to collapse
if you do not have your cpu id and
if you do not have access to adb and
you're stuck in apx mode
then things are looking grim.....
the only way to get into your tab without yr cpuid is fastboot
but you need adb working for that
someone else was stuck in apx mode a day or two ago, try a search...maybe...

I'm sorry guys I was a little off of this thread .
I will be glad to help you guys to get your UID or any problem that you have even though I don't have the Tablet anymore.
Thanks for all and God bless you all.
dibb_nz said:
if you do not have your cpu id and
if you do not have access to adb and
you're stuck in apx mode
then things are looking grim.....
the only way to get into your tab without yr cpuid is fastboot
but you need adb working for that
someone else was stuck in apx mode a day or two ago, try a search...maybe...
Click to expand...
Click to collapse
There is no way to fastboot the tablet in that mode, the only way is to get the UID and then decode it and NVFlash the Bootloader after it is done then put ICS or HC and the EC_ROM files and the tablet will be working again.

I'm gonna throw in the towel and just buy a new mobo for cheap, it seems im screwed without the UID and cant retrieve it either
I wish the previous owner would have gotten the UID beforehand
thanx for the all the help though

Joey22688 said:
I'm gonna throw in the towel and just buy a new mobo for cheap, it seems im screwed without the UID and cant retrieve it either
I wish the previous owner would have gotten the UID beforehand
thanx for the all the help though
Click to expand...
Click to collapse
Sent from my A500 using xda premium
Just come across this check here: /sys/firmware/fuse/acer_cpuid

dibb_nz said:
Just come across this check here: /sys/firmware/fuse/acer_cpuid
Click to expand...
Click to collapse
What do I exactly do?
I dont have any access to the devices files and do not have a dump

[Q] Probelm installing v3 bootloader/recovery

I'm having a problem using the following guide, and I can't seem to find anyone asking the same question...
http://forum.xda-developers.com/showthread.php?t=1622425
Following all the instructions, at step 3 in the directions, I get all the info from checking my SBK number, however the last two lines read: file not found bootloader.img, command failure bootloader download failed.
As there was no bootloader.img and I couldn't find any info on such a file, I pushed ahead, thinking this was common.
I can get into APX mode without issue, its the following steps where I seem to have a problem.
Using the first method listed in step 6, I am never prompted with a "press any key to continue", it just launches straight into attempting the install, and freezes installing (I forget the exact file name but I believe it's the bootloader, it is right in the beginning) it stalls at 131702/78908 (I think those numbers are right)
Using blackthun3r's tool renders the same result. I've tried everything can't figure it out.
I am on a stock 033.00_PA_CUS1 rooted using blackthun3r's tool, which worked perfectly...
Also, I never see the tab entering download mode when in APX it just sits with a black screen.
Anyone have any clue where I'm going wrong here?

Are APX/Download mode drivers installed properly
killdevilfalls said:
I'm having a problem using the following guide, and I can't seem to find anyone asking the same question...
http://forum.xda-developers.com/showthread.php?t=1622425
Following all the instructions, at step 3 in the directions, I get all the info from checking my SBK number, however the last two lines read: file not found bootloader.img, command failure bootloader download failed.
Click to expand...
Click to collapse
the most important thing at step 3 is having the tool "see your uid" the rest...dont worry about.....
I can get into APX mode without issue................
............Also, I never see the tab entering download mode when in APX it just sits with a black screen.
Click to expand...
Click to collapse
ok, you must ensure the apx/download mode drivers are installed.
For your tab to enter download mode it needs the apx drivers...you should see the windows new hardware wizard installing them, and check out the guide again there's a picture of where to look for them in Device Manager....
Yes APX mode is a black screen AND the white led is lit on the power button.
with the apx flash tool, did you install the .apx files from the guide?
thats about all i can offer, dont know anything about step 6.
just make sure u have the boot/recovery aka apx aka download mode drivers installed and installed correctly...good luck

Right Driver
The driver listed when I connect the device in ATX mode is "Acer USB Boot-recovery driver"... is this the correct ATX driver or is there another, as the image shows "Acer Picasso USB-Boot-recovery driver"

killdevilfalls said:
The driver listed when I connect the device in ATX mode is "Acer USB Boot-recovery driver"... is this the correct ATX driver or is there another, as the image shows "Acer Picasso USB-Boot-recovery driver"
Click to expand...
Click to collapse
That, is a very good question!!! I dont know whether there is a dedicated APX driver or whether its a generic term for the 'Picasso' drivers as seen in the image.
All I know is that if these 'boot/recovery' Drivers are not installed then the flash wont work. Keep in mind too, that these nvflash methods are fairly new to most of us, so we're all on a steep learning curve -
I'd suggest going thru the process again, write out each step in your own words if you need to, and take your time - it can be difficult relating the instructions your eyes see on screen with what your fingers are tapping out on the keyboard AND having your head trying to make sense of it all!!! Pick one of the methods, it doesn;t matter which, and stick with it - switvhing between 2 or more can make things even more confusing....
I;m about to go on try civs method now, will let u know how i go
***************************************
UPDATE
steps 1-2-3 check
on getting into apx mode noticed driverrs didnt install
but checked dev man and they were listed as Acer not picasso
ran nvflash
entered 1
entered sbk
command window says nvflash starting.......
that was it couldnt get any further....no entering download mode on tab
uh-oh -
***************************************

Yes- there is a dedicated APX Driver
***************SUCCESS***********
What a mish!!!! Got it going on the 5th time.....flashing r14 as i write...woohoo!
If I knew how to post images then I would...took screenies all the way thru.
Reinstalled all drivers after the first fail.
On next start found new hardware wizard wanted to install drivers for APX!!!!
I have never seen that before
After poking around a bit got them installed with...wait for it...under adb???
They installed as Acer "FastBoot Interface".....
It never showed in my system tray or as Picasso USB etc....in dev man
my next try failed again....waiting for tab to enter download mode......
For my last go at for the nite I bbutton comb'ed to APX first a
nd connected cable 2nd.....within a minute or two Acer Logo on tab
followed by :"entering download mode....within 10 mins I was good to go......
All I can tell you is to keep trying till u get it!!!!!

Probelm installing v3 bootloader/recovery
I have the same problem tried everything your not the only one.

shenny585 said:
I have the same problem tried everything your not the only one.
Click to expand...
Click to collapse
Driverz reinstall them......each time u attempt a flash and it fails at some point, you must reinstall them.
After poking around a bit got them installed with...wait for it...under adb??? They installed as Acer "FastBoot Interface"..... It never showed in my system tray or as Picasso USB etc....in dev man my next try failed again....waiting for tab to enter download mode...... For my last go at for the nite I bbutton comb'ed to APX first a nd connected cable 2nd.....within a minute or two Acer Logo on tab followed by :"entering download mode....within 10 mins I was good to go....
Click to expand...
Click to collapse
If they don't show up in either device manager (under adb/apx or USB controllers) or the system tray "safely remove h/ware then they are not installed, if u continue with flash and it fails then u have to reinstall Acer drivers again!!!
install a500 boot manager u can check for a proper connection with this tool....
See link in my sig for a pictorial showing step by step instructions for using apxflash tool
If this still does not work then post back with the following:
What rom and bootloader u have now or began with
What rom u installed at step 4
R u rooted and do u have a custom recovery installed
On validating yr sbk, at step 3, the most important thing here is to see the system info in the command window,
Boot.img errors u see at the end IS A NORMAL PART OF THE VALIDATION in other words its what you're supposed to see. Correct me if I'm wrong but at that command window aren't u supposed to type: go

Help not working iconia A500 after hard reset?

can some one help please. my son had put a password on my a500 and could not remember what it was, so used the buttons to do a hard reset and i got a error saying UNRECOVERABLE BOOTLOADER ERORR (0X19000008) and now it wont start and hangs on the acer logo.
its never being flashed with any rom or rooted,( never needed anything like that)
im quite new to all this guys and could with some help to fix it

mark845 said:
can some one help please. my son had put a password on my a500 and could not remember what it was, so used the buttons to do a hard reset and i got a error saying UNRECOVERABLE BOOTLOADER ERORR (0X19000008) and now it wont start and hangs on the acer logo.
its never being flashed with any rom or rooted,( never needed anything like that)
im quite new to all this guys and could with some help to fix it
Click to expand...
Click to collapse
ok i have flashed the a500 by this guied http://forum.xda-developers.com/showthread.php?t=1276227
all went well, the a500 restared and said please do not restart or reset. updae will finsh in the next 7mins.
and now the a500 is blinking on the andriod logo?

mark845 said:
ok i have flashed the a500 by this guied http://forum.xda-developers.com/showthread.php?t=1276227
all went well, the a500 restared and said please do not restart or reset. updae will finsh in the next 7mins.
and now the a500 is blinking on the andriod logo?
Click to expand...
Click to collapse
ok lets try this out,
power off your tab, hold the volume down and power button, continue holding both buttons until the tab load the acer logo. are you coming into recovery?
if so use the volume to go down to advanced, then wipe dalvic cache, then click yes, it will take a second or two. when the wipe is complete try goin back in the options to find reboot system. with any luck it may fix you
you should see a screen saying optimizing apps .
hope it helps :highfive:
scratch that^^ read your post abit more in depth and im assuming you must have recovery and have wiped dalvik while doin the above,.
try this method to install the v7 or v8 bootloader its the ics version and unlocked/patched im using v7 right now after i got a bootloop and error saying bootloader unverified.
http://forum.xda-developers.com/showthread.php?t=1622425
the area you wanna concentrate on is after step 6 do read the entire thread though and remember to always have your cpuid!!
ALL REPS GO TO CIVATO /BLACKTHUNDER THE A500 DEMI-GODS
Note: please read everything twice before performing any dangerous operations on your tab i will not be held responsible
STEP 6 INSTALLING ICS BOOTLOADER
Automated flashing tool
USING blackthund3r ATX flash tool , It makes it all a little easier !
You need help on this ! Here is a walk thru!
-download the APX-FLASH-Tool & Manager
-Download one of the V8 unlocked bootloader apx flash packages combined with a recovery of your choise.
V8-pubA50._public_recovery.a500apx
V8-Thor_1.7.3_recovery.a500apx
V8-TWRP_2.1.3_ICS_recovery.a500apx
- Firts you do the Steps 1-2-3- 4 of the main guide !!
-1-Reboot your tablet and make sure on your tablet: "Settings" -> "Applications" -> "Development" -> "USB debugging" switch on.
-2-Now start the "A500APXFlash.exe" , the tool will start .
-3-When it askes for your SBK you need to type it in , the v0.4 APX flash tool will give your SBK automaticly !!
-4-Now you select "Use an A500 APX Flash Tool Package.(.a500apx)
-5-Select the package that you want,(you click on the right arrow to continue)
-6-Now you can select "Manual Method" or "Automatic Method". (I always pick Automatic)
-7-Click on "Enter APX Mode" (now it will do his thing)
-8-When it says "Done! press to run again" (even if it says on the bottom of the app "no apx mode devices are connected") you click on the right arrow to continue.
-It will ask if you are ready (click yes if you are)
-Let the app do his thing and wait !!!!!! Until it says "Done! Press and hold power to switch off then power back on!"
Optional A500MANAGER
What does it do :
· One-click APX Mode entry
· One-click Recovery Mode entry
· One-click fastboot entry for patched bootloaders
· Instant logcat viewer
· Instant dmesg Viewer
· Function which dumps the dmesg to a text file on the desktop
· Serial number extraction to make SBK calculation exponentially easier
· Links to ICS Root, A500 APX Flash Tool and two download links (Acer and my mirror) for USB Drivers
· Shows what mode the tablet is in at the bottom

thanks for trying to help m8. the a500 does not turn on so how can i switch on usb debugging?

mark845 said:
thanks for trying to help m8. the a500 does not turn on so how can i switch on usb debugging?
Click to expand...
Click to collapse
erm well mate...u dont, you enter apx mode manually with the reset button and power button.
like i said read the whole thread buddy :silly:

Gotcha mate. So APX mode is like USB dubugging right?
Time to read.
Ill post back.

mark845 said:
Gotcha mate. So APX mode is like USB dubugging right?
Time to read.
Ill post back.
Click to expand...
Click to collapse
im not the best but from i know and understand =
apx mode is like the base programming/flashing state for making changes to your tabs guts/ loading software/os,.
usb debugging is for locating/extracting/uploading information to a system with already loaded software/os
you would need usb debugging to let the flashtool automatically set the tab into apxmode/ as doin it manually can be a hassle, but since you cannot turn usb debugging on to use that feature of the tool you should be ok to manually power into debugging and continue with the guide
tip: i learnt the 1-week till 3am way, you must have the usb plugged to enter apxmode.......or is it the other way around? or is it the charger? lol i cant remember srry
note: yes bruuu read, read, read, these steps are very dangerous to your tab if performed incorrectly. check everything, even look further down the threads to see what problems and solutions others have run into before flashing anything.
let us know how your doin and hopefully we're have it live n kicking again soon

ok im in APX mode. i start the manger and it asks for the SBK.
If i red this right the tool should get the sbk for me?
-3-When it askes for your SBK you need to type it in , the v0.4 APX flash tool will give your SBK automaticly !!
but the tool does not give me it?

-STEP 3=Now go to vache's site to get your SBK
you put your cpuid in and it gives you your sbk
these steps are further down the page (i know its set out weird)
How to get my CPUID ?
On HC Rom or HC bootloader (3.01) or you got a old nandroid backup do this to get your cpuid
-You can find your "cpuid" in one of your "nandroidbackups" that you made with cwm (look on your external SD/clockworkmod/backup=uid.txt ). It's the uid text you are looking for.
-Or when you connect your tablet and type in adb devices in cmd you get your cpuid
-Or usbdeview see more info here , thanks to dibb_nz
ON ICS ROM or ICS booloader (0.3.11 or 0.3.12) do this to get your cpuid:
Or you Install and launch Android terminal app on tablet. Run the following command: dmesg>/mnt/external_sd/dmesg.txt
Open up dmesg.txt (will be stored on your external SD) and look for androidboot.serialno. That is your CPUID.
Or try the following to get your cpuid (thanks to japinder)
-Reboot the Tab & just use the command 'dmesg | grep androidboot.serialno' (without quotes).
It displays the cpuid there & then. No extra lines, no need to save to file & then search. If the Tab hasn't been rebooted in a while, then the line containing 'androidboot.serialno' entry is lost/overwritten, so it won't even be there in the 'dmesg' output. Running the above command after a fresh reboot will always yield the result in an easier way.
so when you got your cpuid go to vache's site put it in and get your sbk, u can use the relative step in the thread to check your sbk is correct if you feel the need.
Enter it into the a500flash tool download a500
flashtool
click arrow
then select a ".a500apx" package u can get one here : skrillax BL's
Im using the v7
click arrow the tool should then do its thang! when it says pass/complete/get me a beer just restart your tab and it should be good to go.,
these are the steps i took on my tab when i had a unverified bootloader error and it fixed it all for me,... but i can not be taken responsible .....your tabs not working anyways so eh lol

Thanks for all your help.
Looks like its just a brick as i have no backups what so ever and it's never being rooted and it won't boot what so ever :crying:
Thanks mark

but it should work with the guide above?
after everything if you dont want it ill take it off your hands or a good price?

I really would like to get this up and running again but i just can't see how. Ive spent the last two days reading as many threads as i can and i can't see any way to fix this and it's doing my head in........
Keep reading on......

Do i still need my cpuid if I'm downgrading to a stock rom?

mark845 said:
Do i still need my cpuid if I'm downgrading to a stock rom?
Click to expand...
Click to collapse
its always good to have cpuid, and i dont think you can go back to stock rom unless you follow the guide and get recovery

[Q] Big troubles: only got fastboot and apx, without cuid.

Hi everyone!
I am workiing on my problem since soo many days, now I am asking for help.
Here is all infos I can provide to you:
1) In january, I played with ROMs and CW, but I don't remember the names or versions I played with. For all those months since january, my A500 worked perfectly. August 20th, in the morning, I pressed POWER to play with it, and nothing happened: only the Acer logo.
- I can't open in recovery, when I press Power + VolumeDown, I have this:
Erasing cache before sd update...
SD update cmd: recovery
--update_package=SDCARD:update.zip
Booting recovery kernel image
Recovery verified failed...
Click to expand...
Click to collapse
- USB from my PC can't communicate with the tablet at this point, so I can't use any ADB commands.
- I can open the tablet in fastboot ! I tried to flash with the command: fastboot flash recovery recovery.img, but the tablet respond:
Fastboot: Not support the command in Lock Mode
Failed to process command download: 004d7000 error(0x2)
Click to expand...
Click to collapse
Even if I launch, in this right order:
fastboot oem unlock
fastboot flash recovery recovery.img
[got the same error msg from the tablet]
- I can open the tablet in APX mode ! But I don't have the CUID of the device........... I tried to find it from USBdview, and I even tried with Linux.
I tried all I could find on Internet. Maybe someone here can help me ? i'm sad that there is nothing to "plug and reset"
Thank you!

MillerXL said:
- I can open the tablet in APX mode ! But I don't have the CUID of the device........... I tried to find it from USBdview, and I even tried with Linux.
I tried all I could find on Internet. Maybe someone here can help me ? i'm sad that there is nothing to "plug and reset"
Thank you!
Click to expand...
Click to collapse
If you were playing with roms and CWM earlier, then there is a good chance your UID number is in one of the Clockworkmod back-up files. Check your external SD card (hope you didn't do something foolish like format it).
You get the "erasing cache etc, because the recovery is borked, and it's trying to run some update file that isn't/is there because it can't boot the OS. Also, bootloader/recovery versions may be mismatched.
With ICS+ you have to have the unlocked bootloader to use fastboot commands. Can't do it on a stock bootloader.
If you do not have a UID, you have to use Linux or an Ubuntu install on your PC. There's a couple threads on how to do this, and what scripts to run. @dibb_nz knows a little more about using linux to get the UID.

MillerXL said:
Hi everyone!
I am workiing on my problem since soo many days, now I am asking for help.
Here is all infos I can provide to you:
1) In january, I played with ROMs and CW, but I don't remember the names or versions I played with. For all those months since january, my A500 worked perfectly. August 20th, in the morning, I pressed POWER to play with it, and nothing happened: only the Acer logo.
- I can't open in recovery, when I press Power + VolumeDown, I have this:
- USB from my PC can't communicate with the tablet at this point, so I can't use any ADB commands.
- I can open the tablet in fastboot ! I tried to flash with the command: fastboot flash recovery recovery.img, but the tablet respond:
Even if I launch, in this right order:
fastboot oem unlock
fastboot flash recovery recovery.img
[got the same error msg from the tablet]
- I can open the tablet in APX mode ! But I don't have the CUID of the device........... I tried to find it from USBdview, and I even tried with Linux.
I tried all I could find on Internet. Maybe someone here can help me ? i'm sad that there is nothing to "plug and reset"
Thank you!
Click to expand...
Click to collapse
Your bootloader is not unlocked which is why u have the fastboot error.
As @Moscow Desire said, if u do not have a nandroid backup stashed somewhere,u need linux to get yr cpuid use this guide here http://forum.xda-developers.com/showthread.php?p=28294316
Sent from my GT-I9300 using Tapatalk 4

I followed all the stepts provided to get the uid with ubuntu. But I got this message from the terminal:
[email protected]:~$ cd Desktop
[email protected]:~/Desktop$ sudo su
[email protected]:/home/ubuntu/Desktop# gcc apx.c -o apx -lusb-1.0
apx.c: In function ‘main’:
apx.c:22:17: warning: format ‘%lx’ expects argument of type ‘long unsigned int’, but argument 2 has type ‘uint64_t’ [-Wformat]
[email protected]:/home/ubuntu/Desktop# ./apx
Error: Failed to open device!
Click to expand...
Click to collapse
I left a message in the topic, now I wish for a path to solve the error.
Thanks for your help !

There's quite a bit of info all thru that thread, you may find an answer in there somewhere. I can't help with linux side of things sorry. .if u are u runnin 32bit rather than 64bit there is a slight alteration to the commands, thats about all I can offer at this point
Sent from my GT-I9300 using Tapatalk 4
---------- Post added at 08:02 PM ---------- Previous post was at 07:55 PM ----------
MillerXL said:
I followed all the stepts provided to get the uid with ubuntu. But I got this message from the terminal:
I left a message in the topic, now I wish for a path to solve the error.
Thanks for your help !
Click to expand...
Click to collapse
dibb_nz said:
There's quite a bit of info all thru that thread, you may find an answer in there somewhere. I can't help with linux side of things sorry. .if u are u runnin 32bit rather than 64bit there is a slight alteration to the commands, thats about all I can offer at this point
Sent from my GT-I9300 using Tapatalk 4
Click to expand...
Click to collapse
Oh, one other thing...power off yr tab and enter apx mode via the buttons...use paper clip to push in the reset button, you should feel a click as u push it...hold it in and then press the power button, wait for the power light to come on and then release the power button. After another second release the reset button. .it can be finicky to get right..if I remember correctly yr tab should vibrate too
Sent from my GT-I9300 using Tapatalk 4

yoga 2 1050F can only access BIOS, let's go to RMA?

Hello everybody, I was trying to revert to a 4.x rom because bluetooth tethering was not working... anyway I used Intel Phone Flash Tool and it seems like he failed to flash boot.bin but restarted anyway
SO I only have the Intel BIOS, I can access all the settings, but I cannot start it in Fastboot mode (it just hangs on FastBoot Starting...) or anything that resembles Android.
Still this BIOS seems more a PC to me than a tablet so I am posting here because maybe there is someway to attach an USB OTG (for example) and boot something from there.

@ionioni is working on a safe downgrade path. We did mine but it could be a disaster if not followed correctly. Your other choice is Lenovo repair support. When i bricked mine, it only took 6 days to get it back in my hands. You could also try the steps here... http://forum.xda-developers.com/showpost.php?p=62237383&postcount=5
Sent from my YOGA Tablet 2-1050F

Thank you very much @workdowg, I passed by that thread, just "DNX" mode does not work on my tablet.
So Repair Support it is.
It's very sad such an awesome tablet has so poor ROM that people has to downgrade it...

Mr.Gamer said:
................but I cannot start it in Fastboot mode (it just hangs on FastBoot Starting...) ..............
Click to expand...
Click to collapse
that is DNX mode!!! that message translates to: i DNX have started and now i am waiting for YOU to give me a (fast)boot image to start... so that message is exactly the message indicating that you ARE in dnx mode.
updated: read this http://forum.xda-developers.com/thinkpad-tablet/general/yoga-tab-2-830-1050-1380-to-kitkat-t3240487
edit:
before anything:
1. download/extract the files attached to this post, now start your tablet (using the Pwr+VolUp+VolDown) to get to that somehow confusing "Fastboot starting..." message = DNX mode (you must get to that message before continuing!)
2. run the extracted tmp-root-1050F-lollipop.exe file (i am assuming you are on the X64 = Lollipop firmware as that screen pictures you attached shows), should do some stuff and in the end if all well will drop you to a root shell (in that post theres a PrtScr for reference), just follow the messages it's pretty easy. should the exe get stuck/not work put your tablet again in DNX mode and try the other file tmp-root-1050F-kitkat.exe. (this means somehow the bios got downgraded partially on your attempt to return to kitkat). this is just a test to see how to move on, it will not fix nor change anything on your tab, after you reboot it will be in the same state as before (that is if you don't do stuff in that root shell of course)
- report back which one worked (gived you a shell)
- also do you want to go back on kitkat or do you want to stay on lollipop? is important to know as the steps are different