Related
Hi folks. I have tried the Odin process three times to try to get CWM functioning on my I/O tab with no luck.
The actual Odin process seems to work fine; however, when I reboot the tab to enter recovery mode; I never get the recovery option. I only have the USB symbol and the downloading option. Also, in the upper left corner, I have:
Fastboot USB download protocol
bootloader version unknown
baseband version %s
serial number:
lock state unlocked
What am i missing? Can the I/O tab use CWM?
Thanks!!
I had the same thing, but when I am trying to root the device it just lock on boot screen. I am not a dummy but something is wrong where several users have diffrent symptoms. I would wait until further development is done. This is still a little shaky.
Odin CWM doesn't work for some reasons ..
Use this post to get rooted
http://forum.xda-developers.com/showpost.php?p=15735928&postcount=2
Follow the instructions carefully !!
Download CWM and do an Install on CWM (it will install 4.0.0.4)
copy the required files to the root directory /sdcard/ (main directory if you don't know)
-Get the roms from HERE
-Get the su_busybox_misc-sam_tab_10.1-051511 HERE
Flash in the ROM 1st .. the apply the SU update (in RECOVERYMOD BEFORE you reboot)
Data / wipe
THEN REBOOT
I missed that 2nd update zip .. and trust me its a pain to get it rooted after that ..
The same procedure will not work again once you're on TW3.1 rom .. you will need an image of the system files and NVflash now..
BTW if you can do NVflash .. then I can send you the image files for 3.1TW rooted ..
fgarcia25 said:
I had the same thing, but when I am trying to root the device it just lock on boot screen. I am not a dummy but something is wrong where several users have diffrent symptoms. I would wait until further development is done. This is still a little shaky.
Click to expand...
Click to collapse
Ha .. I have 3 IO to play with (from friends)..
1st one is rooted out of the box ..
2nd one cannot communicate on FASTBOOT
3rd one does everything nicely (thats the one I had the image extracted with NVFlash)
I'll say it nicely before someone comes to say it rudely, this probably belongs in a general section rather than the development section (that is, until you develop a method to get around the restriction you've found )
Workaround method
http://forum.xda-developers.com/showpost.php?p=16196597&postcount=3
Plus I have the images to go with in case you brick yours
bill.allrobots.org said:
I'll say it nicely before someone comes to say it rudely, this probably belongs in a general section rather than the development section (that is, until you develop a method to get around the restriction you've found )
Click to expand...
Click to collapse
If you have fastboot working, then rooting is as simply as 'fastboot boot [cwm recovery filename].img'
I spent a long time getting fastboot to work, but the only fix was to finally download PDANET software to my PC and install it while it was connected to my tab. After that I got fastboot working.
Fastboot made the rooting process 100% easier. You can root any stock ROM with it and not have to reflash to 3.0.1.
Questions or Problems Should Not Be Posted in the Development Forum
Please Post in the Correct Forums and Read THIS
Moving to General
I had the same problem with my I/O. I finally got a recovery option. What I did was flash the Euro version of TW located in the development section (which is buggy as ****).. After that I Installed CWM and flashed pershoot's root tools. Then I flashed the latest TW Rom. Everything is running smoothly, despite the samsung apps fc. Be weary of the disclaimers located on all the sections I have suggested. All of these steps are at your own risk...
Odin worked on my I/O tab after i put TW on it. I had to boot the tab into CWM via fastboot from a mac
Hi guys,
Using civs guide and nvflash method - i flashed the v4 unlocked BL -
all went well and i was done in 4:-5 mins max....thanks civ
In the options for recovery flash I chose No.5 "cwm new". so after the flash i jumped straight into recovery and backed up....on the recovery home screen
i noticed it displayed my cpuid - and not the usual 11 digit number but my
original HC 15 digit number!!!!
This is great news....if its correct......can someone else confirm this???
Is this due to the v4 BL or is this due to HWCBN recovery???
I believe the recovery images are specific to the BL or maybe the BL requires a
specific recovery not sure on that, anyone know for sure????
Does this mean that those who do not have their CPUID can retrieve it using
"cwm new"????
dibb_nz said:
Hi guys,
Using civs guide and nvflash method - i flashed the v4 unlocked BL -
all went well and i was done in 4:-5 mins max....thanks civ
In the options for recovery flash I chose No.5 "cwm new". so after the flash i jumped straight into recovery and backed up....on the recovery home screen
i noticed it displayed my cpuid - and not the usual 11 digit number but my
original HC 15 digit number!!!!
This is great news....if its correct......can someone else confirm this???
Is this due to the v4 BL or is this due to HWCBN recovery???
I believe the recovery images are specific to the BL or maybe the BL requires a
specific recovery not sure on that, anyone know for sure????
Does this mean that those who do not have their CPUID can retrieve it using
"cwm new"????
Click to expand...
Click to collapse
Previous recovery added a "uid.txt" file to the backup, I don't see that at all with the V4 bootloader & Touch v1.7 (for some reason v1.7.2 hangs at 'Booting recovery kernel image'. By "cwm new" are you referring to ezterry's "Public CWM"?
"cwm new" "option 5" thor 1.7.2
amphi66 said:
Previous recovery added a "uid.txt" file to the backup, I don't see that at all with the V4 bootloader & Touch v1.7 (for some reason v1.7.2 hangs at 'Booting recovery kernel image'. By "cwm new" are you referring to ezterry's "Public CWM"?
Click to expand...
Click to collapse
Oh hell, just check...i thought "Option 5" cwm new was thors 1.7.2 -ARI 2.99 beta not picking it up just booting in now....
yeh they all save uid.txt just not the one we need for sbk
"cwm based recovery v5.5.0.x (thor2002ro rev1.7.2) Iconia A50x"
is what it says. Displayed on recovery home screen CPU UUID: and my orig CPUID
I got rid of 1.7 b/c touch buttons had a mind of their own - and have been on TWRP since flashing v3 -
Not sure why you got the hang with it had you powered of and rebooted after the flash - I use ARI to boot to recovery havent tried button combo - but i will now
loving 4 way boot menu - wish we could have that option from the pwr button
The new 1.7.2 version of CWM automatically displays the CPUID, it is a new feature that is mentioned in the changelog for the recovery. It also has a boot into apx mode (download mode) feature added too.
cruise350 said:
The new 1.7.2 version of CWM automatically displays the CPUID, it is a new feature that is mentioned in the changelog for the recovery. It also has a built into apx mode (download mode) feature added too.
Click to expand...
Click to collapse
I realise that m8' that's not the point I'm trying to make!
The point is this
It displays yr original HC cpuid
No other method I have come across can do this once u flash any type of ICS based rom
Its why everyone bangs on about keeping a copy of ya cpuid once u leave HC . The only way to get it (till now so it seems) Is to downgrade back to HC??
And what's even more interesting, is that when I ran my Old UID into SBK, and my new UID into SBK, it generated the exact same sequence. I noticed this about a month ago
Also, now, after several bootloader flashings, and rom testings, my UID is now exactly the same as my original HC UID
Ohhhh.... UID merry-go-round
Moscow Desire said:
And what's even more interesting, is that when I ran my Old UID into SBK, and my new UID into SBK, it generated the exact same sequence. I noticed this about a month ago
Also, now, after several bootloader flashings, and rom testings, my UID is now exactly the same as my original HC UID
Ohhhh.... UID merry-go-round
Click to expand...
Click to collapse
No way M.....true????
I just having a look now,
Huh?? Old as in 15 and new as in 11 digits???
No I got diff sbk,s
Trying out nvflash and apxflash see wot happens.......
So now same uid for u...?.
Oh yeh I got that with 1.7.2
But not the others
K I'm off to do some investigative flashing, lol
I bought this tablet and I want to install a custom rom. I am not interested in dual booting. I found a thread titled
"[GUIDE]A500/501/G100W-Installing ICS V8 UNL-BL & CWM Or back to HC BL(24-6-2012) "
Information there is a little confusing to me. On my A200, the steps were simple, unlock boot loader, install CWM and then root/install rom. Then I was done. Seems like I have to do more steps on theA500, which I don't mind I just want to do it right. Is it my understanding that the thread is for dual booting, it also talks about CPU ID.
I found another thread that talks about Afterota v1.09, do I only need to just do this for what I want to do or do I need to do more? Why would I need to install a ICS bootloader, I have ICS now, stock, doesn't it already have it? I tried looking at the Q/A but I just ended up more confuse.
Could someone just give point me in the right direction so I can go about unlocking bootloader and installing CWM so I can install a custom rom.
I have Android 4.0.3 Kernel Version 2.6.39.4+ Stock
Side question, my unit is a 16gb model but its only reading about 12.71gb, does anyone know why?
A500 works differently: the stock ICS BL is locked and cannot be unlocked from fastboot. What we can do however, is to flash custom BL, since we know the device "Secure Boot Key". In general the term "ICS BL" means my patched BL, which you can find in my signature. There is a bunch of guides to get it flashed on the forum, and blackthunder made a tool to simplify the process.
Skrilax_CZ said:
A500 works differently: the stock ICS BL is locked and cannot be unlocked from fastboot. What we can do however, is to flash custom BL, since we know the device "Secure Boot Key". In general the term "ICS BL" means my patched BL, which you can find in my signature. There is a bunch of guides to get it flashed on the forum, and blackthunder made a tool to simplify the process.
Click to expand...
Click to collapse
Alright, so I do not need to do
Option 1 use Afterota for A500/G100W IF YOU ARE ON OTA ICS and follow this thread
or
Option 2 , keep reading.... don't be a chicken , just do it !!.
then I just need to use blackthun3r tool? I tried it but when I launch A500APXFLASH.EXE it ask me for a SBK and the guide said this "the v0.4 APX flash tool will give your SBK automaticly !!" but its blank it has not given me SBK automatically. So I was directed to this thread
http://forum.xda-developers.com/showthread.php?t=1810618
which has the "SBCalc "
which then directed me to
http://forum.xda-developers.com/showthread.php?t=1624645
which reads
GET ME MY CPUID!!!
There are 2 different cpuid
ICS CPUID has only 13 digits/characters and is your "serial no." as reported in settings, on your sdcard cover and on the box
we are only interested in the 15 digit HC CPUID this can only be got:
(1) From a PC using Blackthund3rs A500 manager
(2) From your device using Terminal Emulator App
(3) From USBDeview must have previously used the Tab under HC with the PC you're using
(4) From a uid.txt in any Honeycomb-cwm backup in external_sd/clockworkmod/backup/"your_HC_backup" folder
(5) From adb devices if you're running honeycomb
(6) From cwm 1.7.2 via on screen display and a text file - great if you are on ICS already
(7) Master_Ellis has posted that he found the HC cpuid in /sys/firmware/fuse/acer_cpuid - add a zero to the front!!!
please if anyone uses this let us know if this is correct!!!
thanks Master for the heads Up!!!
(8) Gersma's most excellent OTA Toolmakes most of this thread obsolete!!!! Thankyou Gersma for all you've done OTA Tool is all anyone ever needs....
Features :
I don't get it though, I thought you said all I needed was the blackthund3r apx flash utility. I'm really confuse, can you specify what I need to do?
I went back to the original thread where the blackthund3r flash tool is and it clearly says
"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 I do not see the SBK come up automatically. Man all I want is to be able to flash roms ;/ Can you specify what I need to do please I do not want to jump the gun here and brick my device. I see two files in the zip file, a500 Manager v1.0.2 and Apx Flash Utility v0.4
Alright I figured out what I was missing and manage to go through the whole process easily. I have Apex now but how do I install CWM or TWRP? WHen I go into recovery I get a dead android.
Lots of trials and errors lol so I figured out Recovery only works the first time, is there any way to have CWM on there permanently?
Update
Recovery always works now, wasn't sure if that was a glitch or what. Anyways, thanks Skrilax, that little piece was enough for me to get going. I understood the guide once I knew what I needed which required me reading a few threads. Guide kinda needs to be tweaked a little.
F9zSlavik said:
Lots of trials and errors lol so I figured out Recovery only works the first time, is there any way to have CWM on there permanently?
Update
Recovery always works now, wasn't sure if that was a glitch or what. Anyways, thanks Skrilax, that little piece was enough for me to get going. I understood the guide once I knew what I needed which required me reading a few threads. Guide kinda needs to be tweaked a little.
Click to expand...
Click to collapse
Recovery not sticking is due to having a stock rom. Rooting with ICS Root 7.1.1 stops this
Sent from my Iconia A500 using Tapatalk 2
Just noting: stock recovery won't work, and if you ever applied OTA, booting Android will overwrite recovery, unless you remove the updater. And for the guides, all will work, some are more automated, some less.
Please
I tried several times to ask on this forum if someone can help me, but no luck so far i am verry desperad now
I have install Skrilax CZ bootloader V8 on my tab, but thats all i dont now what i need to do now to install a custom rom, i have put the update file in to the sd kart but it wont install.
I have this option only
option
Reboot
Fastboot Mode
Boot Primary Kernel Image
Boot Secondary Kernel Image
Boot Recovery
Set Boot Secondary kernel Image
Set Debug mode on
Wipe Cache.
So cany anyone tel me what i must do to root and install CWM recovery
so i can install then after custom roms?
Is ther no tutorial from heren to folow!!
Please don't double post it gets confusing -
remember, this is the holiday season and alot of us are having a break and spending time with our long neglected family members, we can't be around here as much as we would like....
Yes there are guides on using fastboot, skrilax's bootloader thread for one...
PLEASE don't flash an update.zip it doesnt work that way, you'll end up stuck again
you should read the first 2 guides linked in my sig..
I too need help exactly on this point
I have not the slightest clue what to do and i do not think this is a duplicated post.
I spent days to come at this point and i don't want to **** things up.
I red your posts dibb_nz and it just gets more confusing
You write in this post :
PLEASE don't flash an update.zip it doesnt work that way, you'll end up stuck again
and then you write here: http://forum.xda-developers.com/showthread.php?t=2049778
Have your Custom Rom downloaded and copied to your External SD Card ready to install immediatelyafter flashing skrilax's patched bootloader
So is it too hard for someone to tell what to do here to install a custom rom ?!
P.S. I also got [ ERROR: Invalid primary (LNX) kernel image ] on my screen.
http://s15.postimg.org/e02avn6aj/IMG_0020.jpg
something to worry about ?
Thread closed, duplicate of this one:
http://forum.xda-developers.com/showthread.php?t=2076510
Hello every one
After i try the new Android v4.2.1 rom by randomblame i want to get back to v4.1.2 but i did not format data this is what i think that brick my A500
So i recovered my device via EUUs_SBK_Acer_A500_1.016.05_COM_GEN1
but after that i couldn't flash any ics rom or ics bootloader
every time i try to flash ics bootloader with "blackthund3r_A500_APX_Flash_Tool_v0."@ the device stock during the process and stock in apx mod so i have to recover it again and so on
i have try : BabSector to format partition and try Afterota after th euus recovery but without luck
i can't even flash ics on hc bootloader "lightspeed 4.8"
now i'm running hc 3.2.1 rom by civato
what i'm doing wrong ? Help Please
I'm really missing CM10
bad English ....sorry
haytham-88 said:
Hello every one
After i try the new Android v4.2.1 rom by randomblame i want to get back to v4.1.2 but i did not format data this is what i think that brick my A500
So i recovered my device via EUUs_SBK_Acer_A500_1.016.05_COM_GEN1
Click to expand...
Click to collapse
So you can boot into the OS OK??
Did you root it?
You may have to take an OTA or update.zip to 3.1 first and flash the v8 from that as I'm unsure it will work from 3.0.1
but after that i couldn't flash any ics rom or ics bootloader
every time i try to flash ics bootloader with "blackthund3r_A500_APX_Flash_Tool_v0."@ the device stock during the process and stock in apx mod so i have to recover it again and so on
Click to expand...
Click to collapse
is their an "apx device" listed in hardware and printers or in your pc system tray?
do you get "acer apx mode" displayed on your tab?
now i'm running hc 3.2.1 rom by civato
Click to expand...
Click to collapse
go to the root guide in my sig and Make absolutely certain you do the first 4 steps in that guide.
d/l the latest apx Flash manager tool v 1.0.2 and use the bundle market in it to install bundle #17
OR
use civato's nvflash package instead as this requires your tab to be in apx mode (black screen/pwr lite on) to work AND will give you a more specific error if it fails.
Once the flash is complete BOOT STRAIGHT TO CWM and flash your cm10.1 rom
THEN Do a factory/data reset and enable wipe of /data/ media (in mounts/storage menu) wipe cache and dalvik cache too. Reboot to cm 10.1!!!
Please do all the steps in the order they are given -
If "it doesn't work" we will need you to tell us what is or isn't happening and where in the process it fails!!!
Good luck
Thank you for reply
dibb_nz said:
So you can boot into the OS OK??
Did you root it?
You may have to take an OTA or update.zip to 3.1 first and flash the v8 from that as I'm unsure it will work from 3.0.1
Click to expand...
Click to collapse
Click to expand...
Click to collapse
Yes I can
It's rooted because it is a custom ROM with CWM Recovery 1.3.4 by Thor
Is it OK to flash the ICS Bootloader from HC 3.2.1 "Civato-FLEXSTRIKER-HC.3.2.1 R6-BASE"?
is their an "apx device" listed in hardware and printers or in your pc system tray?
do you get "acer apx mode" displayed on your tab?
Click to expand...
Click to collapse
Yes their is an "apx device"
and my tab shows "entering apx mode..." or something like that ! with ACER logo
go to the root guide in my sig and Make absolutely certain you do the first 4 steps in that guide.
d/l the latest apx Flash manager tool v 1.0.2 and use the bundle market in it to install bundle #17
OR
use civato's nvflash package instead as this requires your tab to be in apx mode (black screen/pwr lite on) to work AND will give you a more specific error if it fails.
Once the flash is complete BOOT STRAIGHT TO CWM and flash your cm10.1 rom
THEN Do a factory/data reset and enable wipe of /data/ media (in mounts/storage menu) wipe cache and dalvik cache too. Reboot to cm 10.1!!!
Please do all the steps in the order they are given -
If "it doesn't work" we will need you to tell us what is or isn't happening and where in the process it fails!!!
Good luck
Click to expand...
Click to collapse
"USB drivers from the Android SDK" on step 1 maybe that is what I need
So I'll give it a try and tell you what happens.
And again thank you for your help.
Well..
I followed your root guide and used Civato's nvflash package, lots of things happened.
file no 1 is the first result
then file no 2 , here is where I get stuck in apx mode again !!
errors i get :
error formating partition 4
error formating partition 6
The thing is, not every time I try to recover my tab it works
I succeed only once of every 15 tries to recover my tab.
so maybe some partitions are messed up or something.
One time, I tried to flash Civato's nvflash package again , and after few times the bootloader was flashed correctly, but the recovery wasn't !!
So, I tried to use fastboot to flash the recovery ... and it went O.K
After that, I restarted to recovery, formated data (factory reset) , cache , delvik cash, flashed the rom, rebooted the tab ...... but nothing happened !!
and i'm stuck here
I've done lots of searching around the forums and most of them recommend BabSector or tdv4_rollback_rom or EUUs .
only EUUs are working, and even that would work one time of around 10 to 20 tries.
do i have to flash the primery kernel via fastboot , and if so, how to get the kernel from the rom?
thanks in advance
haytham-88 said:
Well..
I followed your root guide and used Civato's nvflash package, lots of things happened.
file no 1 is the first result
then file no 2 , here is where I get stuck in apx mode again !!
errors i get :
error formating partition 4
error formating partition 6
The thing is, not every time I try to recover my tab it works
I succeed only once of every 15 tries to recover my tab.
so maybe some partitions are messed up or something.
One time, I tried to flash Civato's nvflash package again , and after few times the bootloader was flashed correctly, but the recovery wasn't !!
So, I tried to use fastboot to flash the recovery ... and it went O.K
After that, I restarted to recovery, formated data (factory reset) , cache , delvik cash, flashed the rom, rebooted the tab ...... but nothing happened !!
Click to expand...
Click to collapse
Boot to fastboot mode
Fastboot erase userdata, cache, system and flexrom - use separate command for each partition, note any write errors and post back.
Fire up apxflash tool....you MUST dump, save then use your tabs BCT when u get to that window - this should repair the bct error shown in the 2nd text file.
Also tick "show nvflash commands " this will show any read/write or partition errors..
If you get partition errors run babsector (d/l in the root guide) and follow the steps I posted there.
Boot directly to recovery and try flashing a rom again
I've done lots of searching around the forums and most of them recommend BabSector or tdv4_rollback_rom or EUUs .
only EUUs are working, and even that would work one time of around 10 to 20 tries.
do i have to flash the primery kernel via fastboot , and if so, how to get the kernel from the rom?
thanks in advance
Click to expand...
Click to collapse
No u shouldn't have to flash a kernel its included in the rom.
A full and complete erase is required first
(If there are errors here like can't read/write or bad data....your tab is toast) if not,
The bct error must be repaired next, else your tab won't flash any rom at all, even if the tool says PASS
Then reset your partitions with babsector.far
(Any errors like those listed above....your tab is toast)
With all the errors you're having its pointing to a faulty chip, flashing should not be this problematic.
Be sure to follow the direct order of repair....otherwise you'll be compounding errors
Sent from my A500 using Tapatalk 2
Sorry for my late reply
I didn't run apxflash tool I have try something before that I have flash a HC rom over the ICS bootloder "it is wrong I know" but it went OK and the tab boot to the rom!!!!!!!!!
So now I have ICS bootloader with HC rom. what is going on ??
I have a new long work "13 hour" and I can't spend alot of time with my tab but I want to understand what is wrong with my tab
I'm really thankful for your time.
haytham-88 said:
Sorry for my late reply
I didn't run apxflash tool I have try something before that I have flash a HC rom over the ICS bootloder "it is wrong I know" but it went OK and the tab boot to the rom!!!!!!!!!
So now I have ICS bootloader with HC rom. what is going on ??
I have a new long work "13 hour" and I can't spend alot of time with my tab but I want to understand what is wrong with my tab
I'm really thankful for your time.
Click to expand...
Click to collapse
Well, thats different!!!
Are you running stock HC or is it a custom one?
Which recovery are you using?
Download Acer Recovery Installer from the market, it will tell you your bootloader version. You will need root priveleges to run this
dibb_nz said:
Well, thats different!!!
Are you running stock HC or is it a custom one?
Click to expand...
Click to collapse
A custom rom, Civato-flexstriker-hc.3.2.1 r6
Which recovery are you using?
Click to expand...
Click to collapse
CWM Recovery v5.5.0.x(thor2002ro/digetx rev1.7.3)
Download Acer Recovery Installer from the market, it will tell you your bootloader version. You will need root priveleges to run this
Click to expand...
Click to collapse
Bootloader Version: 0.03.14-MUL
and i can acsses Skrilax_CZ's bootloader V8 bootmenu Mode and all of it's functions
i think that i did not understand the bootloader thing yet!!!
haytham-88 said:
A custom rom, Civato-flexstriker-hc.3.2.1 r6
CWM Recovery v5.5.0.x(thor2002ro/digetx rev1.7.3)
Bootloader Version: 0.03.14-MUL
and i can acsses Skrilax_CZ's bootloader V8 bootmenu Mode and all of it's functions
i think that i did not understand the bootloader thing yet!!!
Click to expand...
Click to collapse
ok lets start with the bootloader and why we need it...
On most android devices your first step to flashing a custom rom is to root so you can flash a custom recovery....
With our Acer Tabs since HC 3.2 the bootloader is locked...meaning even having root access did not give us the ability to 'flash' a custom recovery - its just not possible....the only way to do it is with the "patched" bootloader - I don't know how the magic works, but the devs managed to find a way to 'trick' the system into allowing their version of "patched bootloader" to be installed which would allow the flashing of a custom recovery....and there is a very specific way of getting this patched or unlocked bootloader onto your tab....this is with a program called "nvFlash" which runs via "apx mode" or "acer download mode" using our tabs unique ID, the cpuid.....to make it even easier The devs created a "package" which will nvFlash the patched bootloader AND a custom recovery all in one go!! Once we'd done that all we needed to do was to boot straight to recovery and flash our desired ICS or JB rom!!!
In the beginning, way back in the day....some folks weren't at all comfortable going to these lengths just to have a custom rom, so some of the rom cooks gave us the choice to upgrade to the patched bootloader or to stick with the HC bootloader, by flashing a custom HC kernel after the bootloader flash....this is what you were alluding to earlier??
Most roms now only work with the patched bootloader i.e. skrilax_cz 3.14 MUL -v8
keep in mind these are ICS and JB roms...
I hope that provides a bit more understanding on the bootloader thing and why we need it...
Now back to your original problem, not sure why you cannot flash a JB rom, have you tried it again??? I just cannot think of anything that would prevent you from flashing anything except an HC Rom - You might wanna ask the question in the JB rom thread...there might have been specific steps you needed to take to downgrade from 4.2 (can't think what though) or others may have posted similar problems...sorry couldnt help you out ....
...but let us know how you get on, good luck!!
Finally I have moved from HC to JB and that is how :
- ubdating the bootloader from v8 to v9
- nothing changed trying to flash any rom I already have
- then and I don't know why I download an Android 4.3.1 from TegraOwners forums [WIP]A500/A501 JB-MR2(4.3.1) - V8t6
link http://forum.tegraowners.com/viewtopic.php?f=9&t=1312
flash the rom and everything went OK !!!
Finally Fixed
Finally I have moved from HC to JB and that is how :
- ubdating the bootloader from v8 to v9
- nothing changed trying to flash any rom I already have
- then and I don't know why I download an Android 4.3.1 from TegraOwners forums [WIP]A500/A501 JB-MR2(4.3.1) - V8t6
link http://forum.tegraowners.com/viewtopic.php?f=9&t=1312
flash the rom and everything went OK !!!