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Greetings! First of all, I would like to thank anyone who takes the time to help me diagnose and resolve this issues, let alone anyone who takes the time to read this thread.
I've been having issues with my Xoom (ICS 4.0.0) for about 3 weeks now.
A brief history of the issue's occurrence:
-I unrooted the device and returned it to stock.
-Everything was fine and dandy until one day it spontaneously said something along the lines of 'Android is upgrading..', and then performed a reset.
-Since resetting, it bootloops.
The device only turns on when plugged into a charger and hard reset.
The device only turns off when allowed to boot loop for minutes and then hard reset (it simply does not reset, and just turns off).
I'm not the most technically-savvy person with android devices but here are some things I've done/noted.
When trying to use adb commands, it does not recognize the device or properly issue commands.
I've tried wiping data/clearing cache to no avail.
EDIT: I've tried fastbooting, but the bootloader will not unlock. When trying to unlock, it simply resets and then acts as though it was never unlocked.
I have no idea how to return it to a stock image. All I know is that I have a micro-SD and some spare time.
Could anyone help me understand what exactly is going on with my Xoom?
If I can provide you with any more information, please let me know.
Thanks again. (=
If it was stock and spontaneously upgraded it sounds like a bad OTA upgrade. I've been rooted from the start so never have taken an OTA upgrade...don't you need to accept it or can it just upgrade on it's own?
Anyway, can you get it into fastboot mode?
Volume up and power, then at dual core screen, press volume down...if you see something like "entering fastboot mode" you're not bricked. You do not have to re lock your bootloader. Just make sure you have downloaded the correct stock files for your Xoom model to your PC and flash it.
If you haven't done so, just google 'recovering Xoom using fastboot' and you should get some good information.
Good luck!
Remember to grab the MZ604 files if you have the Wifi only version of the Xoom.
http://developer.motorola.com/products/software/ <------ Grab the files here. The files are for the US version of the Wifi Xoom only.
Instructions to return it to stock
1) First you need the Moto Drivers - Read this thread to START you - http://forum.xda-developers.com/showthread.php?t=981578
Should have these drivers installed if you have rooted your Xoom before.
2) Make sure you have the latest SDK - adb and fastboot should be in /platform-tools -
http://developer.android.com/sdk/index.html
Should have the android SDK if you have rooted your Xoom before.
3) Place all the downloaded stock image files into the SDK Tools folder.
4) If you are booting up from scratch, you can get the Xoom in fastboot mode by doing the following. Use command prompt to perform the rest of the steps
Hold VolDown and Power button will boot unit for fastboot mode
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash recovery recovery.img
fastboot flash userdata userdata.img
fastboot erase cache
fastboot oem lock
If you Xoom is booted up already follow the commands below using command prompt to perform the steps
adb reboot bootloader <---- reboots the Xoom into fastboot mode.
fastboot flash boot boot.img
fastboot flash system system.img
fastboot flash recovery recovery.img
fastboot flash userdata userdata.img
fastboot erase cache
fastboot oem lock
As Always If This Was Helpful Hit the Thanks!
Yeah, what Mjamocha said...
okantomi said:
Yeah, what Mjamocha said...
Click to expand...
Click to collapse
LOL Thanks.
okantomi said:
Anyway, can you get it into fastboot mode?
Click to expand...
Click to collapse
Yes, I can. But so far nothing has been successful in terms of fastboot commands.
okantomi said:
You do not have to re lock your bootloader. Just make sure you have downloaded the correct stock files for your Xoom model to your PC and flash it.
Click to expand...
Click to collapse
When I try to execute fastboot commands such as 'fastboot flash boot boot.img'.. it says the following:
Device still locked. Device must be unlocked first. Failed to process command error(0x8)
Whenever I try to unlock the bootloader, it appears to be successful at first and then the device reboots. But it just reboots to a bootloop, and the bootloader still says its locked. Perhaps I made a mistake in communication. The bootloader is currently locked and will not unlock, as just described.
When I try to unlock it and it reboots, even if I access the fastboot menu right away, it still says the device is still locked.
Thoughts?
Can you get into recovery? With the Xoom off (to make sure it's really off, hold volume up + power for a few seconds), hit the power button and when you see the M logo, wait a very brief moment (like a fraction of a second) and hit the volume down button. When it says "recovery" on the top left, hit the volume up. If you can get in there, either restore a nandroid (if you have one) or do a factory reset.
slacka-vt said:
Can you get into recovery? With the Xoom off (to make sure it's really off, hold volume up + power for a few seconds), hit the power button and when you see the M logo, wait a very brief moment (like a fraction of a second) and hit the volume down button. When it says "recovery" on the top left, hit the volume up. If you can get in there, either restore a nandroid (if you have one) or do a factory reset.
Click to expand...
Click to collapse
Yes, I can get into android recovery. However, within a second of switching into recovery mode, the robot falls down and there appears to be a red triangle caution sign containing an exclamation point.
When trying to do a factory reset, it says all data is wiped (as normal). Upon rebooting, it continues to bootloop. So essentially the factory reset and cache clear options in the Android Recovery menu do not produce the expected results.
Pretty odd. I didn't mess with the Xoom at all prior to this issue.
Try flashing just a recovery img to hopefully get your recovery working again. I think you can flash a custom recovery even if the bootloader is locked (i could be wrong but worth a shot) I attached the Rogue "recovery-rogue-1.3.0.img". Try a "fastboot flash recovery recovery-rogue-1.3.0.img"
EDIT: Sorry, I guess you can't flash a custom recovery with a locked bootloader.
slacka-vt said:
Try flashing just a recovery img to hopefully get your recovery working again. I think you can flash a custom recovery even if the bootloader is locked (i could be wrong but worth a shot) I attached the Rogue "recovery-rogue-1.3.0.img". Try a "fastboot flash recovery recovery-rogue-1.3.0.img"
EDIT: Sorry, I guess you can't flash a custom recovery with a locked bootloader.
Click to expand...
Click to collapse
Yeah, just tried it to no avail. Thanks so much for your help anyway. (=
I'm not sure what to do now.
I would keep trying to unlock it using different USB cables and different USB ports on your computer. I've had unlocks fail a bunch of times and for some reason, it was because of a $hity USB cable and/or a bad port on my computer.
slacka-vt said:
I would keep trying to unlock it using different USB cables and different USB ports on your computer. I've had unlocks fail a bunch of times and for some reason, it was because of a $hity USB cable and/or a bad port on my computer.
Click to expand...
Click to collapse
I hear ya. I've tried 2 different cords and 3 different computers. I'm using a Mac (10.6.8) right now, but have used 2 PCs (Vista + 7).
Out of curiosity, when you tried to flash the custom recovery, did you get the same "device still locked" error or did it appear to flash but then recovery failed?
slacka-vt said:
Out of curiosity, when you tried to flash the custom recovery, did you get the same "device still locked" error or did it appear to flash but then recovery failed?
Click to expand...
Click to collapse
I got the 'device still locked' error. Weird, huh?
How about trying to lock it again even though it says it's locked -maybe it's stuck in an "in-between state"? Try a "fastboot oem lock" and if it finishes then try a "fastboot oem unlock". I know, I'm grabbing at straws here. I thought I bricked my Xoom last week. All I did was an "adb reboot bootloader" and the device went to a black screen. Volume Up + Power did nothing. I ended up buying a T5 (Torx 5) bit at the store, removed the back cover and disconnected the battery for 30 seconds using a piece of paper to separate the contacts. The Xoom booted right up after that.
slacka-vt said:
How about trying to lock it again even though it says it's locked -maybe it's stuck in an "in-between state"? Try a "fastboot oem lock" and if it finishes then try a "fastboot oem unlock". I know, I'm grabbing at straws here. I thought I bricked my Xoom last week. All I did was an "adb reboot bootloader" and the device went to a black screen. Volume Up + Power did nothing. I ended up buying a T5 (Torx 5) bit at the store, removed the back cover and disconnected the battery for 30 seconds using a piece of paper to separate the contacts. The Xoom booted right up after that.
Click to expand...
Click to collapse
Yeah I tried that. Won't lock or unlock successfully. Locking produces no difference, and unlocking produces the same 'device still locked' error. This is getting out of hand! Thanks so much for your advice. You think I should open it up?
I hate to be so persistently annoying about this, but could anyone possibly suggest a method of working around the locked bootloader?
Is there anything I can do with an SD card to remedy the device's stubborn foolery?
I think you should give it a try, I have bricked my xoom a few times and have always been able to flash the stock imagine to recover. You really have nothing to lose by pulling the battery pin just be careful.
Sent from my Xoom using xda premium
I don't know if I'm technically-equipped enough to do that. )=
Sounds easy, but I imagine it would be rather easy to screw something up? Essentially what I should do is unseat the battery, right?
cherlamperter said:
I don't know if I'm technically-equipped enough to do that. )=
Sounds easy, but I imagine it would be rather easy to screw something up? Essentially what I should do is unseat the battery, right?
Click to expand...
Click to collapse
I have looking for a utube how to guide but no luck, I just might make one for you so you will know what to expect. Give me a few and I will get back to ya.
Sent from my Xoom using xda premium
Hey guys, how are you?
Well, I wished to root my Moto G, so I (tryed?) to unlock the bootloader. Alright, done it, but then I ran into some trouble...
After the booting up, everything started forceclosing and since then, when I try to boot it, I get a black screen after the Motorola logo.
Now, I am really really worried about my phone. I got it a month ago. I'm so afraid I really f****d up my phone right now that my hands are shaking.
I'm new to Android, so sorry if the solution is pretty obvious. And if it's not, could explain it very carefully to me? I don't know what to do.
My best wishes to you, guys.
I'm assuming you used superboot if so that would happen.
The logo sort of blured out right just press volume down and power and it would work
Or did this happen when you were just trying to unlock bootloader?
TomGlass1 said:
I'm assuming you used superboot if so that would happen.
The logo sort of blured out right just press volume down and power and it would work
Or did this happen when you were just trying to unlock bootloader?
Click to expand...
Click to collapse
Yeah, that happenned when I was trying to unlcok bootloader.
And well, my computer now doesn't even recognizes my phone.
EDIT: It appears as "Fastboot falcon S" in the Device Manager. Tried installing some drivers I found in the Internet, but it didn't work.
Explain exactly what happened please. Was the unlock successful and did you just bootup normally after or did u do anything else in fastboot mode? Why are you trying to install fastboot drivers again, as you already wouldve had them to unlock the bootloader. Did you try installing recovery or some root img from fastboot? You said its forceclosing, but it isnt starting at all now?
Some things you can do right now (if your bootloader is unlocked) is to flash a recovery (twrp,cwm) through fastboot and if you think most system files (or settings) are beyond repair, flash your firmware version though fastboot. Will point you to the guides for them, but post more info if you want help.
hemanthmahesh said:
Explain exactly what happened please. Was the unlock successful and did you just bootup normally after or did u do anything else in fastboot mode? Why are you trying to install fastboot drivers again, as you already wouldve had them to unlock the bootloader. Did you try installing recovery or some root img from fastboot? You said its forceclosing, but it isnt starting at all now?
Some things you can do right now (if your bootloader is unlocked) is to flash a recovery (twrp,cwm) through fastboot and if you think most system files (or settings) are beyond repair, flash your firmware version though fastboot. Will point you to the guides for them, but post more info if you want help.
Click to expand...
Click to collapse
Alright, just after I unlocked, when I was booting, I got a message saying that "xxxx has stopped working/failed to initialize/something like that". And then, when I rebooted, I got the usual message of the "bootlocker has been unlocked". After that, the Motorola logo started animating, but then I just got a black screen. I can't turn it off and the battery just got depleted (I'm charging right now).
When I try to connect it in my computer, the PC recognizes it as "MTP Device" or "Fastboot falcon S" when fastbooted. I can't install any drivers and the Motorola Device Manager doesn't recognizes it either.
Well, if there is some missing information, just ask me. I tried to describe my problem the best I could. Anyway, sorry for my bad English and thanks in advance for any effort trying to discover what's wrong.
Motorola Device Manager isn't helpful in this state as it doesn't handle things in fastboot. You already have all the required drivers (fastboot falcon S is the right driver afaik, falcon being motog codename) for flashing your stock firmware.
1. First, you can try the "Factory" option in bootloader (the third one, use volume down to move selector, volume up to select), though this might not really work for major issues.
2. When in fastboot mode, use "fastboot getvar all" to get the firmware details if you already didn't know about it.
3. Otherwise if yours is a standard gsm (non dualsim/non cdma), just download Blur_Version.174.44.9.falcon_umts.Retail.en.GB (UK stock for gsm, 4.4.2)
Download the mfastboot files to use rather than fastboot for flashing. You might need to modify your commands a bit for various firmwares.
http://forum.xda-developers.com/showthread.php?p=47820707 (refer this thread for flashing your stock firmware)
All the firmwares are in either of the links below (all around 400mb):
http://sbf.droid-developers.org/phone.php?device=14
(or)
http://www.filefactory.com/folder/c6cdedc45a775d27
I still don't get why many ppl are getting these errors after unlocking, very bad unlock method of moto if so ( I didnt get any such issues though).
When I use the "fastboot getvar all" command, it says "waiting for device". The phone is already connected, but the Moto G doesn't recognizes it's connected either.
I'm getting more and more afraid I really hardbricked it.
http://www.mymotocast.com/download/MDM?platform=windows
Tried installing these drivers? Your fastboot doesn't seem to be setup properly. How did you unlock without a working fastboot driver? You are trying that command in bootloader mode right?
Already installed it from the start. The message I got is always this:
"There aren't any updates for your device at the moment
Current Version: N/A"
My fastboot: Doesn't matter the operation I do, I always get this <waiting for device> and the phone is already connected into the computer. And the phone doesn't recognizes it is connected too.
And greeeeat news: my phone now doesn't charges either. I get stuck on a screen with a battery logo and 0%, when connected to the charger. Still, I still can access the fastboot mode. Well, am I lucky or not?
I'm pretty confused with this. How exactly did you unlock without a working fastboot (no waiting for device issue)? Did you change your pc drivers after unlock or trying this from a different pc? When you say "phone doesn't recognizes it is connected" you mean it says "Connect USB data cable" below "Device is UNLOCKED"? If so, maybe try another usb port cause it should normally say "Transfer Mode: USB Connected" regardless of proper drivers.
Your phone will chrarge no matter what though, no worry about that. It needs to say "Battery OK (Charging)" when connected to PC
No, as long as you have working your device isn't technically bricked in any sense. Don't worry, get that fastboot working again and anything can be fixed.
Also you didnt say whether or not you tried that "Factory" option in bootloader!
hemanthmahesh said:
I'm pretty confused with this. How exactly did you unlock without a working fastboot (no waiting for device issue)? Did you change your pc drivers after unlock or trying this from a different pc? When you say "phone doesn't recognizes it is connected" you mean it says "Connect USB data cable" below "Device is UNLOCKED"? If so, maybe try another usb port cause it should normally say "Transfer Mode: USB Connected" regardless of proper drivers.
Your phone will chrarge no matter what though, no worry about that. It needs to say "Battery OK (Charging)" when connected to PC
No, as long as you have working your device isn't technically bricked in any sense. Don't worry, get that fastboot working again and anything can be fixed.
Also you didnt say whether or not you tried that "Factory" option in bootloader!
Click to expand...
Click to collapse
OMG. I tried that "Factory" option before but it didn't work. Now I tried a second time and it worked. Thanks a lot! Really :laugh:
Anyway, now my phone is back again and rooted. Thanks for the help, guys!
Thaiane said:
Already installed it from the start. The message I got is always this:
"There aren't any updates for your device at the moment
Current Version: N/A"
My fastboot: Doesn't matter the operation I do, I always get this <waiting for device> and the phone is already connected into the computer. And the phone doesn't recognizes it is connected too.
And greeeeat news: my phone now doesn't charges either. I get stuck on a screen with a battery logo and 0%, when connected to the charger. Still, I still can access the fastboot mode. Well, am I lucky or not?
Click to expand...
Click to collapse
Guys the problem occurs due to corruption of /data folder. Even I had the same issue.
What you can do is
1. Connect your phone to PC in fastboot mode.
2. In fastboot, enter the command "adb erase userdata" and "adb erase cache" without quotes and reboot you phone. It will work for most of the devices, if it doesn't I have some other workaround too.
help
forgotter said:
Guys the problem occurs due to corruption of /data folder. Even I had the same issue.
What you can do is
1. Connect your phone to PC in fastboot mode.
2. In fastboot, enter the command "adb erase userdata" and "adb erase cache" without quotes and reboot you phone. It will work for most of the devices, if it doesn't I have some other workaround too.
Click to expand...
Click to collapse
I have the same problem. my phone stuck in blank screen after Unlock Bootloader. and then I try to do "adb erase userdata" and "adb erase cache". but my phone has no chenge, still stuck in.
I attach log when enter command adb above.
I'm sorry before. I can't spech English well
jidurrr said:
I have the same problem. my phone stuck in blank screen after Unlock Bootloader. and then I try to do "adb erase userdata" and "adb erase cache". but my phone has no chenge, still stuck in.
I attach log when enter command adb above.
I'm sorry before. I can't spech English well
Click to expand...
Click to collapse
The log you have posted contains only the help commands of adb and not the actual commands you gave.
Give a try to factory reset from fastboot mode on your phone. And do you a custom recovery installed in your phone?
forgotter said:
The log you have posted contains only the help commands of adb and not the actual commands you gave.
Give a try to factory reset from fastboot mode on your phone. And do you a custom recovery installed in your phone?
Click to expand...
Click to collapse
I've tried factory reset for several times, but no change as well.
yes, I get a CWM in my phone. and then, what have I do?
jidurrr said:
I've tried factory reset for several times, but no change as well.
yes, I get a CWM in my phone. and then, what have I do?
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2704207
Go to the above forum.
Sorry for late reply was busy with studies.
I had flash stock firmware
through PC
Hi all, first time posting here.
Last night my Nexus 5 turned itself off while charging. Today it won't boot past the white Google logo. I had an unlocked bootloader, but was stock with no root and no custom rom, 5.1.1. I've had the phone for over a year, and bought it from a high street UK phone chain on contract, not from the Play Store.
I've spent the last 6 hours learning, trying, reading, trying again, watching videos, trying not to punch things, but nothing works.
Here's what I know:
I can boot into fastboot mode
bootloader is unlocked
recovery mode is a permanent black screen
"adb devices" cmd in platform-tools does not find the device
I've tried tweaking Windows 7 drivers (driver for fastboot etc.) but to no avail (including using clockwork)
"fastboot devices" returns the serial code for my phone
flashing using fastboot commands gives me "flash write failure" on bootloader-hammerhead xxx .img
even "fastboot erase boot" does not work ("failed to erase partition")
"fastboot reboot-bootloader" simply turns the phone off (does not attempt even a normal reboot)
Unless I'm in some weird driver quandary, I fear my phone may be beyond help as even simple commands do not work. Any help is much appreciated.
I should mention that "flash-all" doesn't work within platform-tools.
The reboot doesn't actually work. When it says "waiting for device" I manually restart the phone into fastboot myself. And then I get write errors, when it's starts pushing the radio file.
imgur . com / eBk4KnX.png
Pete.D said:
Hi all, first time posting here.
Last night my Nexus 5 turned itself off while charging. Today it won't boot past the white Google logo. I had an unlocked bootloader, but was stock with no root and no custom rom, 5.1.1. I've had the phone for over a year, and bought it from a high street UK phone chain on contract, not from the Play Store.
I've spent the last 6 hours learning, trying, reading, trying again, watching videos, trying not to punch things, but nothing works.
Here's what I know:
I can boot into fastboot mode
bootloader is unlocked
recovery mode is a permanent black screen
"adb devices" cmd in platform-tools does not find the device
I've tried tweaking Windows 7 drivers (driver for fastboot etc.) but to no avail (including using clockwork)
"fastboot devices" returns the serial code for my phone
flashing using fastboot commands gives me "flash write failure" on bootloader-hammerhead xxx .img
even "fastboot erase boot" does not work ("failed to erase partition")
"fastboot reboot-bootloader" simply turns the phone off (does not attempt even a normal reboot)
Unless I'm in some weird driver quandary, I fear my phone may be beyond help as even simple commands do not work. Any help is much appreciated.
Click to expand...
Click to collapse
Did you try locking the bootloader, and then unlocking it again?
Oh god , I think you have a hard bricked nexus .
Schoat333 said:
Did you try locking the bootloader, and then unlocking it again?
Click to expand...
Click to collapse
Good idea! Just tried it (which it let me do) but still getting write errors running flash-all.
Given the sudden shutdown and corruption on your phone along with failure to write and to erase sounds like your internal memory has gone bad.
If that's the case you won't be able to to anything. I had the same occur with a Galaxy S3 last year and the nand memory went bad. Unfortunately it does happen, but not often. My guess is you now have a paperweight
Hi everyone. Thanks for your attention
I have a HTC Mini. Today I wasn't able to connect my phone into the wifi. Then, I restarted and afterwards the phone didn't boot at all. It goes only to the bootloader menu. Last two days I was looking for the solution. In the HBOOT menu when I tried to the factory reset it only jumps into the fastboot menu, same thing for the recovery. When I am in the fastboot menu, if I click on reboot, or reboot bootloader it just reboot and the HBOOT menu comes again.
However, my HBOOT menu is locked and when I wanted to try unlock it. following problem happen :
- when I connect the phone to a Mac, Fastboot Devices detect (but only fastboot, ADB devices return nothing) the phone and I could get the token for unlocking procedure, but when I load the the unlock token which sent to me by mail from HTCDEV, nothing happen. it just say everything was successful on Terminal, but nothing shows up on the phone to Confirm unlocking procedure and sometimes it hangs and if I try pushing the token again (the bin file), I receive an error, fail to splash the screen (something like this). However, I already installed the HTC Sync Manager and every other possible driver I could find on the internet.
- When I use windows, after installing HTC Sync and all of the drivers several time, still the command for Fastboot devices or ADB Devices return nothing. I don't care about the phone data or anything. I just want to like Flash the whole operating system and everything . thats fine. But nothing is working properly.
Please guide me if you have any idea about this problem.
Dear friends,
I have LG Google Nexus 5 (Hammerhead D821(H) 32GB) model. Some days ago I tried to install Ubuntu Touch OS through UBports Software in my nexus 5 phone. But I forgot to enable USB Debugging first. So when I started the flash process and try to unlock bootloader, one time it show lock state unlocked. But In reality it was not unlocked. Because of this reason Ubuntu Touch OS installation is not completed and it corrupted my phone. Now I am unable to boot in android also. I also tried to re-flash my phone with Google Factory image but it was not completed because of my bootloader is locked. I don't know how i can unlock bootloader now. I used Wipe Data & Factory Reset option in Recovery Mode but it is also vain. Please help me how can I correct my phone.
Assuming you have adb/fastboot drivers correctly installed, you have to reboot to bootloader by pressing volume down + power and keeping them pressed until you see the bootloader screen. Then connect your phone to the PC and issue the following command from a command prompt:
fastboot oem unlock
Keep in mind that unlocking the bootloader will erase all your data, just like a factory reset, so backup everything first!
shivmahar said:
Dear friends,
I have LG Google Nexus 5 (Hammerhead D821(H) 32GB) model. Some days ago I tried to install Ubuntu Touch OS through UBports Software in my nexus 5 phone. But I forgot to enable USB Debugging first. So when I started the flash process and try to unlock bootloader, one time it show lock state unlocked. But In reality it was not unlocked. Because of this reason Ubuntu Touch OS installation is not completed and it corrupted my phone. Now I am unable to boot in android also. I also tried to re-flash my phone with Google Factory image but it was not completed because of my bootloader is locked. I don't know how i can unlock bootloader now. I used Wipe Data & Factory Reset option in Recovery Mode but it is also vain. Please help me how can I correct my phone.
Click to expand...
Click to collapse
perhaps it can help
https://forum.xda-developers.com/go...l-06-03-14-one-click-factory-restore-t2513937
shivmahar said:
Dear friends,
I have LG Google Nexus 5 (Hammerhead D821(H) 32GB) model. Some days ago I tried to install Ubuntu Touch OS through UBports Software in my nexus 5 phone. But I forgot to enable USB Debugging first. So when I started the flash process and try to unlock bootloader, one time it show lock state unlocked. But In reality it was not unlocked. Because of this reason Ubuntu Touch OS installation is not completed and it corrupted my phone. Now I am unable to boot in android also. I also tried to re-flash my phone with Google Factory image but it was not completed because of my bootloader is locked. I don't know how i can unlock bootloader now. I used Wipe Data & Factory Reset option in Recovery Mode but it is also vain. Please help me how can I correct my phone.
Click to expand...
Click to collapse
You can try with this toolkit http://www.wugfresh.com/nrt/
Surf the net in search of tutorial and info,there are also some videos on YouTube.
I already tried it but vain.
ilciumbia said:
Assuming you have adb/fastboot drivers correctly installed, you have to reboot to bootloader by pressing volume down + power and keeping them pressed until you see the bootloader screen. Then connect your phone to the PC and issue the following command from a command prompt:
fastboot oem unlock
Keep in mind that unlocking the bootloader will erase all your data, just like a factory reset, so backup everything first!
Click to expand...
Click to collapse
Dear Sir,
I tried to unlock bootloader with fastboot oem unlock command many times. When I used this command one time it shows unlocked but when I restarted bootloader it again shows locked.
Eh, this is not good. In my experience, this happens when the eMMC has gone bad, either faulty or write protected for some reason. I have investigated the issue and I have not found a solution yet... Even desoldering it and soldering it to a uSD custom PCB does not allow me to write to it... I am afraid you are stuck with a secretly bricked phone...
I don't know if you already tried all possible,just take a look at this thread.
https://forum.xda-developers.com/go...nexus-5-doesnt-boot-access-adb-t2521691/page3
Or even look at this,LG Flashtool.You don't need unlocked bootloader to flash.
https://forum.xda-developers.com/go...orial-how-to-flash-factory-images-lg-t2713833
The thread is quite old,but needed links are working correctly,i've just checked.