Database Users

[Q] LG G2 - Fastboot mode started udc_start

Hello everybody,
Last night i recieve update for my lg g2 d802 ( update to D80210c)
I downloaded and click install button on update. Phone rebooted and opened twrp. I had rooted device with twrp . After that i couldnt start phone OS, just starting twrp again and again . After that i click on restore to backup nandroid backup i have. It restored backup and than reboot system . After that i have just few words in top left angle :
450 Fastboot mode started
500 udc_started()
After i connect my usb cable have few more :
450 Fastboot mode started
500 udc_started()
660 -reset-
670 -portchange-
740 fastboot; processing commands
What should i do now, is this device completly bricked?

djordjesl said:
Hello everybody,
Last night i recieve update for my lg g2 d802 ( update to D80210c)
I downloaded and click install button on update. Phone rebooted and opened twrp. I had rooted device with twrp . After that i couldnt start phone OS, just starting twrp again and again . After that i click on restore to backup nandroid backup i have. It restored backup and than reboot system . After that i have just few words in top left angle :
450 Fastboot mode started
500 udc_started()
After i connect my usb cable have few more :
450 Fastboot mode started
500 udc_started()
660 -reset-
670 -portchange-
740 fastboot; processing commands
What should i do now, is this device completly bricked?
Click to expand...
Click to collapse
Good to know i wasn't the only one
Im just able to start researching now, i'll update if i find anything, but i assume there's some kind of command that can be given via adb to disable the fastboot and allow the phone os to resume functioning, as my logic indicates since the restore worked for you, your phone is now simply at a point with no attempted update. i did the same process of clicking reboot, twrp looping, restored a backup and twrp still looping
EDIT: Pretty sure it's going to be a flag in a flat file. Combing over my init.rc file now, and i found a strange file called smpl_boot with a single 0 in it, not sure what it does

BStinsonWhadup said:
Good to know i wasn't the only one
Im just able to start researching now, i'll update if i find anything, but i assume there's some kind of command that can be given via adb to disable the fastboot and allow the phone os to resume functioning, as my logic indicates since the restore worked for you, your phone is now simply at a point with no attempted update. i did the same process of clicking reboot, twrp looping, restored a backup and twrp still looping
Click to expand...
Click to collapse
Can you enter Download Mode? (Holding volume down when G2 is turned off and plug the USB)
I also experienced this when restore using TWRP. But fortunately I can flash back to stock.

BStinsonWhadup said:
Good to know i wasn't the only one
Im just able to start researching now, i'll update if i find anything, but i assume there's some kind of command that can be given via adb to disable the fastboot and allow the phone os to resume functioning, as my logic indicates since the restore worked for you, your phone is now simply at a point with no attempted update. i did the same process of clicking reboot, twrp looping, restored a backup and twrp still looping
Click to expand...
Click to collapse
I think you dont understand me, when i did restore twrp shows that restore was completed, and when i do a reboot it shows
450 Fastboot mode started
500 udc_started()
Now i cant do nothing with phone, i try to power off and turn on it just go to
450 Fastboot mode started
500 udc_started()

djordjesl said:
I think you dont understand me, when i did restore twrp shows that restore was completed, and when i do a reboot it shows
450 Fastboot mode started
500 udc_started()
Now i cant do nothing with phone, i try to power off and turn on it just go to
450 Fastboot mode started
500 udc_started()
Click to expand...
Click to collapse
ahh i misread your post thinking you somehow had status messages on your screen during boot and that you got into TWRP each time. the question above this post asking about download mode may help you

BStinsonWhadup said:
ahh i misread your post thinking you somehow had status messages on your screen during boot and that you got into TWRP each time. the question above this post asking about download mode may help you
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2451696
specifically:
adb shell
dd if=/dev/block/platform/msm_sdcc.1/by-name/fota of=/sdcard/fota-backup.img
dd if=/dev/zero of=/dev/block/platform/msm_sdcc.1/by-name/fota
fixed it for me for anyone finding this post that CAN get to TWRP, the above linked post has other hints as well that may work for OP

I got this same thing when I tried to update TWRP using flashify, I can reboot to phone , running CleanRom 2.0 but not to recovery in order to flash other stuff.

ossito2012 said:
I got this same thing when I tried to update TWRP using flashify, I can reboot to phone , running CleanRom 2.0 but not to recovery in order to flash other stuff.
Click to expand...
Click to collapse
I somehow managed to do this as well. Did you get yours working again?
Edit: Fixed it up with this APP (Note that 3 other similar apps did NOT work): https://play.google.com/store/apps/d...l.freegee_free

Yozzo1 said:
Hello everybody,
Last night i recieve update for my lg g2 d802 ( update to D80210c)
I downloaded and click install button on update. Phone rebooted and opened twrp. I had rooted device with twrp . After that i couldnt start phone OS, just starting twrp again and again . After that i click on restore to backup nandroid backup i have. It restored backup and than reboot system . After that i have just few words in top left angle :
450 Fastboot mode started
500 udc_started()
After i connect my usb cable have few more :
450 Fastboot mode started
500 udc_started()
660 -reset-
670 -portchange-
740 fastboot; processing commands
What should i do now, is this device completly bricked?
Click to expand...
Click to collapse
My situation is a little different than yours, but you may be able to do this method (which is what I am working on at the moment). As long as you can get into download mode.
http://forum.xda-developers.com/showthread.php?t=2432476

help !!
Hi, sorry for my english , I'm french
I wanted to flash a custom rom on my LG G2 D802 .
I wanted the Paranoid Android (PA +) with 4.3 JellyBean .
So I made the
Backup
Wipe data / factory reset
Wipe cache partition
Wipe dalvik Cache
After I
Choose zip ( custom ROM ) from sd card
Then I
Reboot System Now
And turn on my laptop, I get an error message saying
[640 ] started Fastboot Mode
[ 690] udc start ()
I realized I had to flash AOSP kernel before changing to a ROM paranoid . But my kernel is blocked and so I have to go back to the stock ROM
When I did this tutorial using lg tools , flashing stops at 49% with an error message .
I also saw that I could access the recovery mod by following this link http://forum.xda-developers.com/show....php?t=2565904(but I saw that I could not otherwise reboot my phone after it was bricking ) and therefore flash my stock Rom which I had made the backup . But I do not know if the ROM has been saved and if it remained in my files after the Wipes.
If it is not there, is that in buying a micro USB ====> HUSB adapter, I could install a stock ROM from a USB key ? Or is there a way I can put files from my computer to my laptop which has no port micro sd?
And is what I could with my kernel "blocked " ?
Thank you very much

Same problem here too. Can't get a recovery installed no matter what i do

Does anyone have a solution yet?? Same thing has happened to me.

If you can't go into download mode but get fastboot mode instead first repair download mode using http://forum.xda-developers.com/showthread.php?t=2477595 and than flash back to stock 4.2.2 using http://forum.xda-developers.com/showthread.php?t=2432476

My G2 can not go into download mode and recover mode, and my computer can not recognise it so I can not put anything to it.
fast boot
udc error.
CAN SOMEBODY
EXPLAIN IN SIMPLE WAY STEP BY STEP.
Thank you

Had this exact error too, fortunately flashing furnace kernel fixed it.
Tahir, I had to try several times until i succeed to boot to my recovery mode, try several times.

was having this issue. but i figured out my problem. the rom i was installing was a note3 rom. hahahaha. thats what happens when u have too many phones. and files in your computer. anyways.
i ddnt have to revert back to stock. i was able to reboot to twrp via hold power button and volume down buttons, when lg pops up, let go and press and hold both buttons again. when white screen with words comes up, press power then power then power. then ur back to twrp, at least mine did. and restored my recent back up.

nimrodsv said:
Had this exact error too, fortunately flashing furnace kernel fixed it.
Tahir, I had to try several times until i succeed to boot to my recovery mode, try several times.
Click to expand...
Click to collapse
How did you flash the kernel if you couldn't get into recovery?
I have download mode, but lg support tool only goes to 49% and I get error.
Would like to flash this kernel if you have another way

rodpgfx said:
How did you flash the kernel if you couldn't get into recovery?
I have download mode, but lg support tool only goes to 49% and I get error.
Would like to flash this kernel if you have another way
Click to expand...
Click to collapse
I could, after 5-6 times pressing Vol Down + Power method

nimrodsv said:
I could, after 5-6 times pressing Vol Down + Power method
Click to expand...
Click to collapse
I have similar issue after trying to install Xdabbed Camera on my LG G2 running with ClaudyG3 ROM.
I have flashed the Xdabbed Camera zip file sucessfully via TWRP 2.7.0.0 but when I reboot the phone after successful flashing the phone went into Fastboot Mode and UDC as mentioned above. Can my phone back again to recovery mode? I have backup ready, but only can restore if I can go into recovery TWRP...please help

epwt said:
I have similar issue after trying to install Xdabbed Camera on my LG G2 running with ClaudyG3 ROM.
I have flashed the Xdabbed Camera zip file sucessfully via TWRP 2.7.0.0 but when I reboot the phone after successful flashing the phone went into Fastboot Mode and UDC as mentioned above. Can my phone back again to recovery mode? I have backup ready, but only can restore if I can go into recovery TWRP...please help
Click to expand...
Click to collapse
Try booting to recovery after you charge your phone for at least one hour and while it's NOT CONNECTED to the computer
If that's doesn't help try using ADB

[Q] Download mode stuck

Hi guys,
Long-time phone rooter/XDA reader, first time posting.
It seems I have finally come across a problem I can't fix by insane amounts of googling and trial&error.
I am currently on some Kitkat custom ROM variant with CWM 6.0.4.4
I'm looking to get back to stock, but my download mode refuses to open. Its stuck at the blue dots screen. (attached picture for clarity)
I've let it sit there overnight, with no change.
I've attempted to use the LGMobile Tool (even this method), but when it reboots my phone, the phone sits on the "LG" screen, and the LG tool eventually errors out ("communication error").
Recently, I managed to back myself into a corner after (incredibly idiotically) accepting an OWA, when my recovery was corrupt, and my download mode would not even open then - and i had to use some bizarre method of commands in Linux to be able to get TWRP on, then flashed CWM and them my ROM.
So what can I do now? I'm assuming my download mode is corrupt - is there a way to flash a good download mode onto the phone?
Any thoughts/input greatly appreciated.
edit:
Ok looks like I have understimated myself.
I used THIS tool to extract my KDZ, to get the LAF file (then renamed it to laf.img)
I then used the instructions from HERE to flash to the correct place.
It did not reboot into download like the thread said it would, but I did a manual download mode entry (while off, hold Volume Up + insert USB) and viola!
I am now currently using the LGMobile tool to go back to stock

Daveasaurus said:
Hi guys,
Long-time phone rooter/XDA reader, first time posting.
It seems I have finally come across a problem I can't fix by insane amounts of googling and trial&error.
I am currently on some Kitkat custom ROM variant with CWM 6.0.4.4
I'm looking to get back to stock, but my download mode refuses to open. Its stuck at the blue dots screen. (attached picture for clarity)
I've let it sit there overnight, with no change.
I've attempted to use the LGMobile Tool (even this method), but when it reboots my phone, the phone sits on the "LG" screen, and the LG tool eventually errors out ("communication error").
Recently, I managed to back myself into a corner after (incredibly idiotically) accepting an OWA, when my recovery was corrupt, and my download mode would not even open then - and i had to use some bizarre method of commands in Linux to be able to get TWRP on, then flashed CWM and them my ROM.
So what can I do now? I'm assuming my download mode is corrupt - is there a way to flash a good download mode onto the phone?
Any thoughts/input greatly appreciated.
edit:
Ok looks like I have understimated myself.
I used THIS tool to extract my KDZ, to get the LAF file (then renamed it to laf.img)
I then used the instructions from HERE to flash to the correct place.
It did not reboot into download like the thread said it would, but I did a manual download mode entry (while off, hold Volume Up + insert USB) and viola!
I am now currently using the LGMobile tool to go back to stock
Click to expand...
Click to collapse
Hey thanks for the post. My download mode will not go past the 5 blue dots screen. I am trying to return to stock but I get the same download mode error. I am rooted and have TWRP installed. This download mode error has happened before. I fixed it by flashing CM and then going into download mode and it worked! But my TWRP is getting an error when installing any rom. It fails and installation and says error executing updater binary. I just need to fix download mode or TWRP. Any help would be great.

Did you already have recovery installed when you were stuck at the 5 dots download mode screen?

How to Connect in ADB ?
Daveasaurus said:
Hi guys,
I used THIS tool to extract my KDZ, to get the LAF file (then renamed it to laf.img)
I then used the instructions from HERE to flash to the correct place.
It did not reboot into download like the thread said it would, but I did a manual download mode entry (while off, hold Volume Up + insert USB) and viola!
I am now currently using the LGMobile tool to go back to stock
Click to expand...
Click to collapse
My phone is also stucked same as yours, How you connect your phone is adb mode. My Phone just show download stuck screen and have no recovery. Any help would be really appreciated.

[Q] Ruined Fastboot mode, but regular boot works?

Okay, so not sure what I did here.
I have an LG G2 ATT version with 4.2.2 installed.
I was trying to install CM, which I already have on my Nexus 7 and love. But the LG G2 doesn't have a nice one-click install app like the Nexus 7 does.
So, I managed to root it, and got SuperUser installed and Clockworkrecoverymod.
At one point I also had TWRP installed, and I think that is where I went wrong. I went to flash a new fastboot / recovery mode and think I selected the wrong one (LG G2 International).
Ever since then, attempting to reboot into recovery using the hardware method (volume down + power) doesn't work. If i force it into fastboot mode using Clockworkrecoverymod or ioroot, I get a strange message.
All the phone shows is white text on a black background:
[830] Fastboot mode started
[940] -- rest --
[950] fastboot; processing commands
then, if i unplug the USB port, I get a few messages. If I replug it in, I get the above message again, with different time stamps.
If I boot normally, it pulls up the normal stock OS, but any attempt to boot into fast mode gets me this message. I can also boot into download mode, but it hangs at 0 %. I tried Flashing a new Recovery using clockworkmod, and it says it worked, but booting into recovery just results in ending up in the same Fastboot mode deadend.
I see the same message if I try to factory reset the phone through the normal software method in options.
So, it is great that I didn't completely brick my phone when I idiotically installed for the wrong mode, but without being able to get into fastboot mode, what are my options for getting back on there and back to stock so I can try again?
And yes, I tried to make a backup on my device, but when I went to go back to it, clockworkmod said it isn't there. Not sure how I messed that up, but anyone have any suggestions on what I can do going forward?

As I understand; If you're trying to boot it to recovery mode, it goes to fastboot mode, right?
If I understood right; you need just flash recovery to your device.
G2 has a different boot process from other devices. If bootloader failed to boot the thing you want to boot, it goes to fastboot mode. That's why it goes fastboot mode when you try to boot it to recovery.

Ah yeah, i just couldn't figure out how to get it out of Fastmode. I was a little confused about the difference between fastmode and recovery.
I seemed to have fixed the problem by AutoRec, for whatever that is worth. Now it boots into TWRP's recovery mode. Shouldn't be hard to get cyanogenmod now.

TheAmericannomad said:
Okay, so not sure what I did here.
I have an LG G2 ATT version with 4.2.2 installed.
I was trying to install CM, which I already have on my Nexus 7 and love. But the LG G2 doesn't have a nice one-click install app like the Nexus 7 does.
So, I managed to root it, and got SuperUser installed and Clockworkrecoverymod.
At one point I also had TWRP installed, and I think that is where I went wrong. I went to flash a new fastboot / recovery mode and think I selected the wrong one (LG G2 International).
Ever since then, attempting to reboot into recovery using the hardware method (volume down + power) doesn't work. If i force it into fastboot mode using Clockworkrecoverymod or ioroot, I get a strange message.
All the phone shows is white text on a black background:
[830] Fastboot mode started
[940] -- rest --
[950] fastboot; processing commands
then, if i unplug the USB port, I get a few messages. If I replug it in, I get the above message again, with different time stamps.
If I boot normally, it pulls up the normal stock OS, but any attempt to boot into fast mode gets me this message. I can also boot into download mode, but it hangs at 0 %. I tried Flashing a new Recovery using clockworkmod, and it says it worked, but booting into recovery just results in ending up in the same Fastboot mode deadend.
I see the same message if I try to factory reset the phone through the normal software method in options.
So, it is great that I didn't completely brick my phone when I idiotically installed for the wrong mode, but without being able to get into fastboot mode, what are my options for getting back on there and back to stock so I can try again?
And yes, I tried to make a backup on my device, but when I went to go back to it, clockworkmod said it isn't there. Not sure how I messed that up, but anyone have any suggestions on what I can do going forward?
Click to expand...
Click to collapse
if you want go back to stock and you can't enter in download mode you can try follow this but USE THE CORRECT FILES FOR YOUR DEVICE!!!!!!!!
http://forum.xda-developers.com/showthread.php?t=2477595
to extract laf.img from kdz.
http://forum.xda-developers.com/showthread.php?t=2600575
Give a thank to the OP of the threat.

[Q] D801 Stuck In Fastboot Mode

Hi,
I tried to install Grola Rom on my phone and unfortunately I think that I may have flashed the ROM for the D802 (I tried to find a faster DL than the FShare link).
My phone is now stuck in Fastboot Mode. I've tried every method to try to get my phone back into regular working condition, but my laptop does not recognize my phone. No matter which driver I install, it shows up as Android in device manager and ADB devices and Fastboot devices shows up nothing.
I was able to get it to boot into download mode for about two seconds before it boots itself back into download mode immediately.
I've tried accessing recovery and download mode, but nothing works.
How would I either get back to recovery or at the very least back to download mode so I can go back to stock?
Thanks,
mjoecarroll
Edit: When I boot up it just says Fastboot Started.
When I plug it in, it says:
--reset--
--portchange--
--reset--
--portchange--

Same problem did you fix it?

LG G2 Hard Bricked

So I wiped the system partition on my LG G2/D800 (mostly out of stupidity) and now I'm stuck in the boot loop.
Symptoms are following:
1. Stuck in the boot loop
2. Will not go into download or recovery mode
3. When turning on the LG logo appears and disappears repeatedly
4. Device is not detected when plugged into the USB
5. Factory reset using VolDown+Power doesn't do anything
I've tried most of the ideas I've been able to find on the forum, but it looks like I'm stuck mostly because I cannot enter download mode and the phone is not detected in any way when plugged into the USB (no many partitions or anything).
Will be grateful for any ideas how to get out of it?

meseer said:
So I wiped the system partition on my LG G2/D800 (mostly out of stupidity) and now I'm stuck in the boot loop.
Symptoms are following:
1. Stuck in the boot loop
2. Will not go into download or recovery mode
3. When turning on the LG logo appears and disappears repeatedly
4. Device is not detected when plugged into the USB
5. Factory reset using VolDown+Power doesn't do anything
I've tried most of the ideas I've been able to find on the forum, but it looks like I'm stuck mostly because I cannot enter download mode and the phone is not detected in any way when plugged into the USB (no many partitions or anything).
Will be grateful for any ideas how to get out of it?
Click to expand...
Click to collapse
so vol up and then plug usb, does not take you to download mode?
if not try using srk tools.. if that doesnt work i think you need to short circuit your motherboard.
http://forum.xda-developers.com/lg-g2/general/lg-g2-unbrickable-fix-real-hard-brick-t2904404
and to go back to stock d800 variant..you said you have..
http://forum.xda-developers.com/showpost.php?p=65643825&postcount=4

raptorddd said:
so vol up and then plug usb, does not take you to download mode?
if not try using srk tools.. if that doesnt work i think you need to short circuit your motherboard.
http://forum.xda-developers.com/lg-g2/general/lg-g2-unbrickable-fix-real-hard-brick-t2904404
and to go back to stock d800 variant..you said you have..
http://forum.xda-developers.com/showpost.php?p=65643825&postcount=4
Click to expand...
Click to collapse
Indeed I cannot enter download mode with vol up then plug usb.
Good news is that I was able to enter qhsusb mode by short circuiting the moterboard. I used srktools to unbrick in qhsusb mode, however it didn't work. The linked guide recommends to flash only laf.img, aboot.img and boot.img. I don't really understand how flashing more can hurt. I also don't completely understand why flashing these should help. After all, I messed only with the system partition. I'll try to follow the guide more closely, but I'm thinking that a better idea would be to flash system partition in a qhsusb mode. I just need to figure out where to get system.img from.

meseer said:
Indeed I cannot enter download mode with vol up then plug usb.
Good news is that I was able to enter qhsusb mode by short circuiting the moterboard. I used srktools to unbrick in qhsusb mode, however it didn't work. The linked guide recommends to flash only laf.img, aboot.img and boot.img. I don't really understand how flashing more can hurt. I also don't completely understand why flashing these should help. After all, I messed only with the system partition. I'll try to follow the guide more closely, but I'm thinking that a better idea would be to flash system partition in a qhsusb mode. I just need to figure out where to get system.img from.
Click to expand...
Click to collapse
So now I can consistently get into ghsusb mode by short curcuiting the motherboard, and I can flash img files with dd. I flashed every partition from the stock FW which was on my phone. Now when hold vol up and plug in usb, I'm ending up in a stock recovery. However, I still cannot enter download mode and the phone still suffers from boot loop if I choose to reboot the phone.

meseer said:
Indeed I cannot enter download mode with vol up then plug usb.
Good news is that I was able to enter qhsusb mode by short circuiting the moterboard. I used srktools to unbrick in qhsusb mode, however it didn't work. The linked guide recommends to flash only laf.img, aboot.img and boot.img. I don't really understand how flashing more can hurt. I also don't completely understand why flashing these should help. After all, I messed only with the system partition. I'll try to follow the guide more closely, but I'm thinking that a better idea would be to flash system partition in a qhsusb mode. I just need to figure out where to get system.img from.
Click to expand...
Click to collapse
am not so sure about laf and rest of stuff.
i know tha once i had the qhusb mode all i had to do is enter download and flash TOT using flash tools.

lg g2 vs980 wont turn on or charge or regconized by pc
i have a probleme with my lg g2 vs980 . when i try to install tho cyanogenmod rom . at firt i intall it and it shows that no sim card. i tried to reintall it again so i have install again the the custom recovery and when i tryien to press the volum downd and power but the phone turned of and evrything is black . i tried to turn it on or charge it but but it didn't . i tried to connect it to pc it didn't get regconized. when i turn it on the phone vibrate but not turned on .plz help me

Bourakhma said:
i have a probleme with my lg g2 vs980 . when i try to install tho cyanogenmod rom . at firt i intall it and it shows that no sim card. i tried to reintall it again so i have install again the the custom recovery and when i tryien to press the volum downd and power but the phone turned of and evrything is black . i tried to turn it on or charge it but but it didn't . i tried to connect it to pc it didn't get regconized. when i turn it on the phone vibrate but not turned on .plz help me
Click to expand...
Click to collapse
go back to stock
you can try the srk tools 2.1 and see if you can get nuke download.
or read here
http://forum.xda-developers.com/lg-g2/general/lg-g2-unbrickable-fix-real-hard-brick-t2904404