USB Brick - Desire Q&A, Help & Troubleshooting

Hello!
Here is my problem. Weeks ago i rooted my phone using unrevoked and I'm also S-off. But yesterday i wanted to flash a new rom, so I wiped and after that took conscious that I was unable to flash a new rom because it was impossible to access my SD-card. I tried to reactivate the my SD-card using differents methods but it didn't work.
So now I totally desesperated, if anyone has any idea of how i could fix it he would become my hero!
PS : sorry for my English.

Try to format your SD card using your computer. Use FAT32. Copy a new ROM file to said card then flash via recovery. If that doesn't work, try using a different SD card, maybe this one is broken (yes, it can happen all of a sudden).
To check if your USB is bricked, try connecting your device when in HBOOT mode (bootloader) to a PC via USB. If the PC can detect the phone, then it's not an USB brick. The phone's screen should also read "HBOOT USB". You can also try fastboot, in which case the display will read "fastboot USB".
If that doesn't solve your problem, please give us more details.
P.S. - You shouldn't have opened a new thread, as there are already lots of threads on this matter.

Related

USB error, cant do nothing with it

This is a strange problem, I cant tell when it started but it did all of a sudden. When I try to connect my phone to my computer it all of a sudden does not recognize the device (it shows under USB in device manager as unknown device). This happens on my laptop and stationary one (XP and Windows Home Server). On my work computer and my girlfriends laptop (Windows vista) nothing happens at all. The only thing happens is my phone shows notification about HTC Sync (doesnt show the "mount SD card" option). I cant install modaco 2.x since it says it isnt signed when I try to run update.zip from "home+power" mode.
Anyone knows a solution? I really want to flash either modaco or the official HTC rom.
latiszm said:
This is a strange problem, I cant tell when it started but it did all of a sudden. When I try to connect my phone to my computer it all of a sudden does not recognize the device (it shows under USB in device manager as unknown device). This happens on my laptop and stationary one (XP and Windows Home Server). On my work computer and my girlfriends laptop (Windows vista) nothing happens at all. The only thing happens is my phone shows notification about HTC Sync (doesnt show the "mount SD card" option). I cant install modaco 2.x since it says it isnt signed when I try to run update.zip from "home+power" mode.
Anyone knows a solution? I really want to flash either modaco or the official HTC rom.
Click to expand...
Click to collapse
have you instaled HTC Sync + the Android SDK? Drivers are included, also ensure you have gone to settings > Application Settings > Development.. and selected USB Debugging in the handset
if you have done the above you should be able to...
Sync your device
Do a nandroid backup
Root your device
and flash, flash, flash
hope this helps
Thing is, all those stuff is checked. The strangest thing is that the phone doesnt even ask me if I want to mount the SD card (to make the phone like a card reader). I successfully flashed the generic rom again (so my phone is not rooted etc etc) but it still cant connect to any computer through USB (except from when in bootloader (back+power). Its really starting to bugging me since I cant transfer music to the phone anymore I tried a hard-reset, flashed a generic rom (the new one) and formatted the SD card (the phone can read and write to/from it without problems).
I've got the same problem for quite some time now and still no answers...! :-(
It seems very few people on these boards know of our exact problem and i've never seen a solution. Also not from the many people on these boards I consider guru's. :-(
I'm at a total loss here...
I will call HTC Sweden today and see if they can help me solve this issue. I will get back to this thread as soon as Ive been speaking to them. This is starting to really bugging me.
First of all, I would try reformatting your SD card on the phone itself via Menu-> SD card & Phone Storage. If you need anything on the card, you'll have to stick the SD card in adaptor and attach it to your PC directly.
Secondly, by the sounds of it you haven't flashed Cyanogens recovery image, or your HBOOT is wrong, if you are getting a problem with the signature on Modacos image. Either flash Cyanogen recovery, or follow the instructions found on another thread for restoring your HBOOT to an earlier version.
Regards,
Dave
foxmeister said:
First of all, I would try reformatting your SD card on the phone itself via Menu-> SD card & Phone Storage. If you need anything on the card, you'll have to stick the SD card in adaptor and attach it to your PC directly.
Secondly, by the sounds of it you haven't flashed Cyanogens recovery image, or your HBOOT is wrong, if you are getting a problem with the signature on Modacos image. Either flash Cyanogen recovery, or follow the instructions found on another thread for restoring your HBOOT to an earlier version.
Regards,
Dave
Click to expand...
Click to collapse
I have tried to format the SD card already, didnt help.
What would the hboot have to do with the SD card mounting? I got the original hboot .0004 or somehting like that (never touched it).
This is the complete infor from my HBOOT screen (power+back).
HERO CVT SHIP S-ON
HBOOT-1.76.0004 (HERO10000)
MICROP-010f
TOUCH PANEL-SYN0104
RADIO-6.35.06.18
Jul 3 2009,15:22:21
Should I update something? And how would that help me get USB connection to work outside fastboot? Since its only working in fastboot and not in the android system itself?
Answer from HTC:
If you are getting the 'USB Device not recognized' error in XP, then your device has a faulty USB port. You need to call our repair line to gte it booked in for repair. That really is all there is, once the hardware dies and starts giving that error, there generally is no hope apart from replacing the USB socket or the whole motherboard. best regards, HTC Europe Support
Would have been nice if they could include in this message where I should turn etc?
I had the same error when I flashed my unit with wrong radio image (newer version) without flashing system and boot images. Then I reflashed those as well and everything worked ok.
frcko said:
I had the same error when I flashed my unit with wrong radio image (newer version) without flashing system and boot images. Then I reflashed those as well and everything worked ok.
Click to expand...
Click to collapse
Is there any update.zip containing all those updates? and would it void my warranty? ex, would HTC be able to see any difference to the hboot etc?
Any guide you could point me to on how to update all those things?
See the following threads with people who have the same problems:
http://forum.xda-developers.com/showthread.php?t=556335
http://forum.xda-developers.com/showthread.php?p=4550938
I see more and more people with this problem!

Lost SD and USB support

Hello,
I have tried attempted to root and flash a new ROM on my phone and now I seem to have lost SD and USB support. it does not recognize any of the SD cards i put it (doesn't realize theres an SD card inside) and does not recognize any USB plugged in.
I have HBOOT .80 and i THINK i got the root correct (lotsa problems along the way so i'm not sure), but i was able to flash a ROM (NexTSENSE) so i think it worked. now, i saw a thread about fixing USB support but that required SD support. and reading that made me feel like i was royally screwed. in any case, any suggestions? I think USB support is still kinda there since I can get it to recognize it in the boot menu. but when i try to do it in recovery and use the flash rom .bat, it says device not found.
it would seem that the main concern right now is that i can't get it to see my SD cards. any of them, even after reformats and whatnot.
i can't connect to HTC Sync or anything of the of the sort. usually when i charge the phone, you get the charging notification but i don't even get that now. sounds like a driver problem but i can't see what is wrong. my computer doesn't even recognize the phone as a device every now and then
Hope i provided sufficient information. New to android scene so don't be too hard on me please =O but yea, any suggestions are welcome. thanks in advance
edit: usb support... ever so slightly back. aka, it charges now. probably was drivers on my lappy getting funny after moving between bootloader and recovery and all that fun stuff
You have the usb brick issue. Check out the thread on that. Also once you are up and running again, root using unrevoked or the fake flash method. All information is available in the dev forum.
ok, i've done some reading and this is what i've found so far. my phone is stuck in USB debug hence no USB support and somewhere along the way, SD support was disabled. from what i see, the fix is to
first:
reload the step1 of root to get back to 1.15 and basic root access.
second:
from there, i can re-enable SD support using the command:
fastboot oem enableqxdm 0
third:
apply USB-Brick fix found in post 1 of thread
and then i should be able to reload ROMs as usual. is this correct?
and where exactly do i put in the command to re-enable SD support? this is what has be confused right now. along with the commands for the USB fix
i am using the tinycore method so i just have the step1.sh. and then in the same console, can i enter that command? should i do it after a reboot? or load back into bootloader to do it. (bootloader or fastloader)
OOOOK. sorry about the continuous posts. putting new info up so it isn't exactly a bump right?
in any case, i used the androidSDK tools and ran the fastboot from there and i think i re-enabled my SD correctly. i was then able to run the USB-brick fix found on modaco forums. all done and done. nowww, since i just went through half the root process (step1.sh with tinycore), do i need to finish it? or since i had already rooted before, is it all done now?
I'm not 100% sure about that as I haven't had to fix the usb brick for ages now!
Download and install titanium backup from the market. If it works fine, then you are rooted. If not, root woth unrEVOked or fakeflash.
All the older root methods that require usb during the root process leave you open to the usb brick again.
Hi fatpandas..
Is your phone ok now? Actually my phone also have a problem like yours last week..until now,i can't fix it..if now your phone ok,can u share with me..thnks in advance..
@csyrix
sorry to hear about your situation. after just being there, i can tell how horrible it is. good news is, if you really have the same problem, then it is definitely fixable.
now, i don't know what method you used to flash yours the first time but from what i've seen, they're mostly the same. what you wanna do first is do that step1 thing where you have a temporary ROM installed. (1.15?) same process as usual.
then you'll need to run 'fastboot oem enableqxdm 0' with phone plugged in while in FASTBOOT (back button + power button thing)
in case you don't know where to put that in, you wanna run that in your command prompt (computer) while operating in the tools folder of the android SDK. (thank god for my limited computer knowledge cuz all the instructions i found just say, "run this command" and like hell if most know how/where)
in any case, the end result will be you having completed step1 and having re-enabled SD support. then turn off phone.
then get the fix from this thread
move that to your SD card (micro SD adapter) and turn back on your phone into bootloader. go to the recovery menu and hold volume up + power to bring up menu and hit the apply: update.zip.
then all should be well. i then moved on to step2 to make sure i had rooted properly. may not be necessary but i remember reading that rooting a rooted device isn't a problem so i just felt the need to do it to be safe.
that should be it. the link provided actually has all the instructions anyways (i hope mine are a bit more clear), but if not, that link should be able to fill in the holes. g'luck sir

[Q] USB failure? A real puzzle for you people

A remarkable problem to be solved. I run oxygen 1.04, s-off, n1 table. No SD partition, just all fat32. Then I decided to do a stupid thing wich was to change launcher by uninnstalling via titanium backup, and then install launcher pro via market. When reboot the device couldnt read the sdcard, wich i solved by using fastboot command "fastboot oem enableqxdm 0" and then "fastboot reboot-bootloader." I then got access to sdcard via recovery (amonra2.0). I Managed to do a restore of previous backup.. But then i got the problem of the device not being recognized in windows (7, 64). It worked via bootloader strange enough.. Thought it was a problem thanks to my mess ups, and decided to unroot and restore factory settings, wich i did by flashing PB99IMG through sdcard.. Are back on scratch, but no usb functionality.. Unrecogniced by windows still.. Are charging though. At some point it asked for Quallcom CMDA (I have AMOLED if that has anything to do with it) usb drivers something, installed Windows Mobile Device Center, no luck... Is this a hardware malfunction? USB brick? Ive searched everything without luck.. Would really appreciate help here, if not im sending it in on garantuee basis.
That's an usb-brick. You can find everything about it here: http://forum.xda-developers.com/showthread.php?t=691639.
Good luck.
Well. I need to be rootet to use this guide, but I aint.. Got hboot 093.001.. Searching for ways to downgrade via fastboot, or some other way since the phone is not detected via regular USB. Anybody got som tricks up their sleave?
If not this works.. Will the folks repairing this phone be able to see it has been tinkered with? I mean since its unrooted?

My phone doesn't detect SD card

Not mine, and not any other SD I tried. I think it's broken from the phone, but I find it very strange that it happened after I did a nandroid restore. The phone rebooted from recovery and when it started all my apps were gone cause they were on ext partition. In menu>sd and phone storage the mount option isn't available, I also can't mount it from recovery and also when trying to enter "flash a zip file from sd card" it says SD not detected.
The card is working btw, I tried it on another phone and it works without problems. I removed it and put it back in but with no result as well. I'm thinking to unroot tomorrow and go to vodafone service.
Any suggestions?
it could be a usb brick... try to connect your phone via usb. Does it work? if not follow the unbrick guide here: http ://android. modaco. com/content/htc-desire-desire-modaco-com/309939/usb-brick-rickrolled-b0rked-fixed/
remove blanck please... im a new user
conecting via usb works, its charging and it asks for some drivers, but usb debugging is not shown on the phone and also that menu that pops up when you connect it, that asks for charge only/disk drive and so on is also not shown but i still think its not a usb brick since it connects fine to my notebook
Sounds like a brick
you can restore SD card. For this, do 'fastboot oem enableqxdm 0' in fastboot mode.
If you bluetooth/FM radio/USB disk mode doesn't work the follow this guide
http://forum.xda-developers.com/showthread.php?t=691639
it usually happens if you restore an nandroid, made in Clockwork, with RA-recovery.

Hard Bricked LG E980 USB device not recognised

My LG E980 is bricked. I can access download mode and that is it! I am unable to boot into recovery,
and the hard reset screen simply sits there forever. My computer only recognizes my device as an "unknown usb device."
I'm unsure what can be done about this, but I feel like this is better than the infamous QHSUB icon displayed when the device cannot be recovered.
Does anyone have a remedy for this problem?? I have GOT to fix this phone and can't afford to Jtag the device, but I'm losing hope that this is possible, PLEASE help. :crying:
Have you installed the LG drivers for your pc and tried the unbrick method?
Yeah dude there's an unbrick method. If this doesn't work just sell the phone on Ebay. http://forum.xda-developers.com/showthread.php?t=2302660
There is never a time when this device cant be recovered. even the qhusb is a fairly simple fix. ill go ahead and make a sdcard boot image tonight. do you have a 32gb sdcard? (or larger) and an sdcard reader, if you have those two things i can make an unbrick.img that you flash toi the sdcard and put in the non-booting phone and it will get you to download mode/recovery mode. ill have to check out what partitions are where as i dont wish to include my efs along with it all .
twill1987 said:
My LG E980 is bricked. I can access download mode and that is it! I am unable to boot into recovery,
and the hard reset screen simply sits there forever. My computer only recognizes my device as an "unknown usb device."
I'm unsure what can be done about this, but I feel like this is better than the infamous QHSUB icon displayed when the device cannot be recovered.
Does anyone have a remedy for this problem?? I have GOT to fix this phone and can't afford to Jtag the device, but I'm losing hope that this is possible, PLEASE help. :crying:
Click to expand...
Click to collapse
Happened to me.
1. With the phone on download mode and plugged in the computer; uninstall the unknown device on your computer using device manager. The computer should try to get the drivers for your phone.
2. If it doesn't. Repeat step one and install the drivers first.
That worked for me hopefully I'll work for you.
Sent from my LG-E980 using XDA Premium 4 mobile app
Yes
riki126 said:
Have you installed the LG drivers for your pc and tried the unbrick method?
Click to expand...
Click to collapse
Yes I tried that. The drivers won't install. I even used another windows 8 computer my roommate has and switched out
the usb cables, still came back "unknown device"
shabbypenguin said:
There is never a time when this device cant be recovered. even the qhusb is a fairly simple fix. ill go ahead and make a sdcard boot image tonight. do you have a 32gb sdcard? (or larger) and an sdcard reader, if you have those two things i can make an unbrick.img that you flash toi the sdcard and put in the non-booting phone and it will get you to download mode/recovery mode. ill have to check out what partitions are where as i dont wish to include my efs along with it all .
Click to expand...
Click to collapse
I do have a 16gb sd card, but I can pick up at 32 gb sd at my local best buy. I have an Asus laptop running windows 8 and it has an SD card reader. I am a little confused (semi-noob) as to how this will work because my phone will boot up, and the led changes colors on the home button for about 4 seconds and then the light stops flashing. The phone is stuck on the LG boot screen, and there is no way out of it but to pull the battery or to reset with power button. Of course no recovery as previously mentioned. I really just want to get back to stock, but I can't manage to get both the windows 8 computers I've tried to detect the phone in download mode. Ever since I switched to the Candykat rom 4.4 the computer wasn't able to recognize the phone, even when the phone was fully functional inside the rom.
I have tried it on my dads windows 7 laptop as well with no dice. Instaled LG drivers, uninstalled LG Drivers, uninstalled device from the Device Manager. I've done everything I could think of. I previously was in a Philz touch recovery, but every rom I tried to flash wouldn't work. I tried to flash another recovery from inside it and then the device bricked like it is now. What a head ache. If you think this method would work, I am more than willing to try it, just unfamiliar with what I need to do on my end.
Okay
stulzerl said:
Happened to me.
1. With the phone on download mode and plugged in the computer; uninstall the unknown device on your computer using device manager. The computer should try to get the drivers for your phone.
2. If it doesn't. Repeat step one and install the drivers first.
That worked for me hopefully I'll work for you.
Sent from my LG-E980 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
I will give your method a shot, but I have done this a lot already. The only thing I can think of is I usually unplug the phone from the computer right after deleting the drivers and uninstalling in device manager. Maybe I should just leave the phone plugged in and see if the computer automatically downloads the drivers, but I don't think it will because I've tried to update the drivers before. It gives me an error code "10" and says the device has malfunction or stopped working This phone has been undetectable via USB since flashing the candykat 4.4 rom. Every computer I've tried (3) and every USB cable (3 again) has displayed it as an "unknown device"
twill1987 said:
I will give your method a shot, but I have done this a lot already. The only thing I can think of is I usually unplug the phone from the computer right after deleting the drivers and uninstalling in device manager. Maybe I should just leave the phone plugged in and see if the computer automatically downloads the drivers, but I don't think it will because I've tried to update the drivers before. It gives me an error code "10" and says the device has malfunction or stopped working This phone has been undetectable via USB since flashing the candykat 4.4 rom. Every computer I've tried (3) and every USB cable (3 again) has displayed it as an "unknown device"
Click to expand...
Click to collapse
I've had similar issues when i had my optimus g. I had to use a pc with xp to flasht he phone, dunno why though. You could give that a shot.
twill1987 said:
I do have a 16gb sd card, but I can pick up at 32 gb sd at my local best buy. I have an Asus laptop running windows 8 and it has an SD card reader. I am a little confused (semi-noob) as to how this will work because my phone will boot up, and the led changes colors on the home button for about 4 seconds and then the light stops flashing. The phone is stuck on the LG boot screen, and there is no way out of it but to pull the battery or to reset with power button. Of course no recovery as previously mentioned. I really just want to get back to stock, but I can't manage to get both the windows 8 computers I've tried to detect the phone in download mode. Ever since I switched to the Candykat rom 4.4 the computer wasn't able to recognize the phone, even when the phone was fully functional inside the rom.
I have tried it on my dads windows 7 laptop as well with no dice. Instaled LG drivers, uninstalled LG Drivers, uninstalled device from the Device Manager. I've done everything I could think of. I previously was in a Philz touch recovery, but every rom I tried to flash wouldn't work. I tried to flash another recovery from inside it and then the device bricked like it is now. What a head ache. If you think this method would work, I am more than willing to try it, just unfamiliar with what I need to do on my end.
Click to expand...
Click to collapse
I dont know lg's download mode, kdz, tot etc all that well. im more of a samsung guy. however qualcomm since the s4 chipset has allowed for sdcards that are properly formatted to boot the os instead of the internal emmc. here is a decent guide, just need to make teh image for this device. this will let your device boot no matter how bad it gets you are welcome to try with 16gb, the rule of thumb i know of is as big as teh emmc is use that same size or larger sdcard, however some people have had sucess withs maller, just not many that i know of. http://forum.xda-developers.com/showthread.php?t=2439367
however afaik the only way to reflash teh bootloader partitions is via kdz/download mode so perhaps the sdcard will let you get into that mode and then you can flash, so long as you keep your sdcard like that it will boot fully, but in order ot get your sdcard back you need to repair teh files on your phone .
Thanks
WeActOnImpulse said:
Yeah dude there's an unbrick method. If this doesn't work just sell the phone on Ebay. http://forum.xda-developers.com/showthread.php?t=2302660
Click to expand...
Click to collapse
I have tried this and unfortunately since the USB drivers aren't detected by the computer there is no way for me to flash back to stock.
Thanks for the information though, I appreciate it.
shabbypenguin said:
I dont know lg's download mode, kdz, tot etc all that well. im more of a samsung guy. however qualcomm since the s4 chipset has allowed for sdcards that are properly formatted to boot the os instead of the internal emmc. here is a decent guide, just need to make teh image for this device. this will let your device boot no matter how bad it gets you are welcome to try with 16gb, the rule of thumb i know of is as big as teh emmc is use that same size or larger sdcard, however some people have had sucess withs maller, just not many that i know of. http://forum.xda-developers.com/showthread.php?t=2439367
however afaik the only way to reflash teh bootloader partitions is via kdz/download mode so perhaps the sdcard will let you get into that mode and then you can flash, so long as you keep your sdcard like that it will boot fully, but in order ot get your sdcard back you need to repair teh files on your phone .
Click to expand...
Click to collapse
Wow, that sounds awesome. I followed most of that. I access download mode on the device by pressing vol up and down simultaneously and plugging in the usb cable. I am more willing to try this, and if it works I will pay you from my paypal. I guess all I need now are those files to run to the sd card. I read the tutorial you posted for the samsung and downloaded the windows disk manager. I am eager to try this method, though it is admittedly very new to me.. If you can post those files, I will follow the instructions you give and pay you a little bit of money for your help!
I am a broke college student so it won't be much, but I really appreciate your response and information on this method with the qualcomm s4.
Here is the unbrick image. follow the guide for your platform (gunna guess windows) and write this to your sdcard after backing it up. from there you need to restore your partitions by flashing them .
https://mega.co.nz/#!YB5xWQ7Y!Qcnx9UmcNn-f6skfiIFN-jd0EeYxdmrQGA1zzP5hfA0
Just wrote it to sd card
shabbypenguin said:
Here is the unbrick image. follow the guide for your platform (gunna guess windows) and write this to your sdcard after backing it up. from there you need to restore your partitions by flashing them .
https://mega.co.nz/#!YB5xWQ7Y!Qcnx9UmcNn-f6skfiIFN-jd0EeYxdmrQGA1zzP5hfA0
Click to expand...
Click to collapse
Okay so I bought the 32 gb sd card. Just wrote the .img file you sent me to the sd card.
I powered on the phone and nothing happened, I got the same LG screen where the led flashes and then stops.
I followed that guide, but am I supposed to go to download mode instead of just powering on the device?
I got a little confused by the samsung jargon lol. I just want to know after I've written the unbrick.zip to the sd card
how do I get my phone to recognize the card is there? And once I am able to do that how do I "restore my partitions by flashing them?"
I do have the factory firmware set to flash through lg flashtool, but the phone can't be detected of course due to the usb issue.
Just want to say thanks for walking me through it this far, I feel like I'm close hopefully but unsure what to do next.
twill1987 said:
Okay so I bought the 32 gb sd card. Just wrote the .img file you sent me to the sd card.
I powered on the phone and nothing happened, I got the same LG screen where the led flashes and then stops.
I followed that guide, but am I supposed to go to download mode instead of just powering on the device?
I got a little confused by the samsung jargon lol. I just want to know after I've written the unbrick.zip to the sd card
how do I get my phone to recognize the card is there? And once I am able to do that how do I "restore my partitions by flashing them?"
I do have the factory firmware set to flash through lg flashtool, but the phone can't be detected of course due to the usb issue.
Just want to say thanks for walking me through it this far, I feel like I'm close hopefully but unsure what to do next.
Click to expand...
Click to collapse
you wrote the image to the sdcard? i wonder if its because you still have the low level bootloaders that it may not be booting from the sdcard, normally this is done to fix qhusb errored devices. as for restoring the partitions all you would need to do is one its booted up push the unbrick image to the phone and use rooted adb shell to write it back onto your phone.
Possible hope??
shabbypenguin said:
you wrote the image to the sdcard? i wonder if its because you still have the low level bootloaders that it may not be booting from the sdcard, normally this is done to fix qhusb errored devices. as for restoring the partitions all you would need to do is one its booted up push the unbrick image to the phone and use rooted adb shell to write it back onto your phone.
Click to expand...
Click to collapse
I meant I used the windows tool to write the debrick.img to the sd card. But no dice, the device isn't recognised.
However! I installed a driver clean up tool and now if I plug in the device it is recognized as Android Original ADB Interface.
The LG Flashtools even says the port is ready! But I get the error code "10" "device cannot start, A request for the USB device descriptor failed."
So now I am stuck on that instead lol. This just sucks.
that sucks about the sdcard, it must be because you arent "truly" bricked. sorry i thought it would help ya :/.
What is the driver repair tool you used? I know this thread is old but I'm having the same problem. I was trying to root my E980 and now my computer wont recognize my device. The phone works perfect, its just when I plug it in to the computer it isnt recognized. How can I fix this?
+1
Just wondering if anyone's come across a solution to this besides a sledge hammer... been having the same "Code 10: Device failed to start" when in Download Mode, though Windows finds a driver fine when the phone is stuck on the LG screen... doesn't help much, though, 'cause it won't receive adb commands. I manually installed the LG USB Composite Device driver, which added a modem and a COM port, both of which Windows recognized to be active, but the LG FlashTool USB Viewer showed no open pipes. I'm a relative noob, so please feel free to point out the obvious, like an alternative to adb that the phone can always receive or a way to brick it the rest of the way so the MicroSD trick will work.
I came across this problem like the OP and just wanna let everyone know that you have to use computer with USB 2.0 port then the driver issue would be fixed.

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