I got a LG V20 H910 model and I cannot reboot the phone into the fastboot mode to get the device ID. I tried to do this on Windows and Linux and everytime I enter the adb reboot bootloader command, it will just reboot the phone but not into fastboot mode. I even tried to turn the phone off and tried booting it up by holding the power button + volume up and power button + volume down and it will still boot up normally.
Any help will be most appreciated.
follow the h910 root instructions, the bootloader doesn't actually get unlocked, instead the bootloader is replaced with a developer bootloader ** do a backup dump using LGUP even though the instructions say you don't have to!!(I ruined a phone by not)..... check antirollback too
https://forum.xda-developers.com/t/root-howto-at-t-h910-up-to-v20g-fully-tested.3664500/ <<< instructions
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I tried with different drivers etc. but its just don't work, i downloaded TOOL ALL IN ONE, but this said that device was found but not said what or which device, only when phone is normally started i see it on the list of "adb devices" and in TOOL ALL IN ONE. Please help thanks in advance =)
Fastboot is an entirely different mode from adb, and as such it requires a different tool. In the console there is a command "fastboot", which is what you need to use to interact with the phone in fastboot mode. You can boot into fastboot mode from power off with the USB to computer plugged in by holding Volume Down, or it might be possible with TOOL ALL IN ONE, I haven't used it much.
Some basic commands:
fastboot flash unlock path/to/unlock.bin # This will flash the unlock bin
fastboot getvar unlocked # This will check if the device is unlocked
fastboot reboot # This will reboot the phone into normal mode, since powering off by holding the power button is a pain
To flash TWRP, there's a more advanced process with some specific requirements, but I'd be happy to share those if wanted.
mwsundberg said:
Fastboot is an entirely different mode from adb, and as such it requires a different tool. In the console there is a command "fastboot", which is what you need to use to interact with the phone in fastboot mode. You can boot into fastboot mode from power off with the USB to computer plugged in by holding Volume Down, or it might be possible with TOOL ALL IN ONE, I haven't used it much.
Some basic commands:
fastboot flash unlock path/to/unlock.bin # This will flash the unlock bin
fastboot getvar unlocked # This will check if the device is unlocked
fastboot reboot # This will reboot the phone into normal mode, since powering off by holding the power button is a pain
To flash TWRP, there's a more advanced process with some specific requirements, but I'd be happy to share those if wanted.
Click to expand...
Click to collapse
Yeah, so I wanted to flash TWRP but it doesen't seem to work i did what was said in many guides but maybe if you tell me how to do it, it will work =) Thanks
So i tried to flash TWRP with the TOOL ALL IN ONE, everything was okey but then error happened called "Unknown device"
First of all, which version of G6 do you have? The US997 one, or the H870?
mwsundberg said:
First of all, which version of G6 do you have? The US997 one, or the H870?
Click to expand...
Click to collapse
H870
For H870 I'm not entirely sure, but I know that for the US997 you have to do a special procedure to make it permanent. Make sure you back up everything first, too.
With the phone in fastboot mode and a computer connected with fastboot installed and the twrp zip downloaded as "twrp.zip" (or whatever you want):
Make sure the bootloader is unlocked: fastboot getvar unlocked (should return "yes" or "true").
Flash the recovery: fastboot flash recovery twrp.zip (replace twrp.zip with the relative or absolute filepath/name).
Unplug the phone from the computer and reboot into recovery by holding Power and Volume Down. When the logo appears, lift your finger off the power button briefly and then continue pressing.
When you get to the factory reset menu hit yes twice, then the phone should boot into twrp (it may flash the LG logo, I've had different behavior on different phones. You won't need to hold the Power-Volume Down combo any more).
In twrp, swipe to allow modification, then in the Wipe menu select Format Data (and enter yes). This will wipe the phone, so make sure everything was backed up beforehand.
From the main menu go to the Reboot menu and select Recovery.
Here it might vary from the US997. Below are suggestions which I think are needed to have it work.
Download the no-verity-opt-encrypt zip, and connect the phone to the computer.
Once it's rebooted into recovery mode: adb push path/to/no-verity.zip /sdcard/
Then from the install menu in twrp install the zip.
Reboot into System from the reboot menu on the homescreen of twrp.
That should do it all.
My unlocked H915 LGV20 wont boot into bootloader/download mode, i can boot into recovery with some trickery but selecting "Boot into bootloader" from recovery also doesnt work, ive tried ADB and the power off and hold volume down button trick too, nothing seems to get it into bootloader/download mode, anyone have any ideas? (FYI im using Arch linux not windows)
If you haven't installed the engineering aboot (part of the root process) then there is no fastboot (bootloader) mode.
Now your post says you can't get into download mode either (with phone off hold vol up + insert USB cable). Was that a typo, or you can't get into firmware update mode either?
-- Brian
LG V20 910
On boot, it shows the LG logo, but does not start.
When I hold Vol up and plug in usb, the same thing happens
When I hold Vol down and plug in usb it does boot to fastboot
Factory reset gives a kernel crash error
adb does not recognize the device
fastboot via command prompt in windows does recognize it
LGUP does not recognize it
Is there a way for me to flash back to H91510e_00_VTR_CA_OP_1205.kdz with Fastboot, or is there another method to get download mode again?
How did you brick your phone? If you just turned it on one day and this happened, it is more than likely a hardware problem.
Since you say that you can get to fastboot -- I am guessing you were rooted since the H910 doesn't have fastboot without the engineering bootloader.
If so, then fastboot boot twrp.img
If TWRP will boot, you can fix your phone from that.
-- Brian
***SOLVED***
so after installing everything following a guide, where as i couldn't open app store after i was done. i decided to uninstall everything and it went great until i restarted my phone after doing so, now i can't exit bootloader and i can only turn my phone off when it's not plugged in, anything returns to bootloader. I have tried several things here to fix it, nothing works as it doesn't show up in the adb commands.
please help me figure anything out
EDIT: I think the issue is that i deleted the cache and then proceeded to reboot my device
EDIT2: and i just locked the oem lovely
EDIT3: i did it
So you are stuck on the fastboot screen? ADB doesnt work on the fastboot screen, only fastboot commands. Careful what guides you follow, and make sure you don't miss any steps. From the fastboot screen you could use the fastboot ROM.
If that doesn't work you can use the MSM tool.
Remember the fastboot ROM will put OOS back on your phone. MSM will put OOS back on your phone and relock the bootloader. So not sure what you were trying to do but you may try and boot TWRP from fastboot one more time if thats what you were trying to do.
OhioYJ said:
So you are stuck on the fastboot screen? ADB doesnt work on the fastboot screen, only fastboot commands. Careful what guides you follow, and make sure you don't miss any steps. From the fastboot screen you could use the fastboot ROM.
If that doesn't work you can use the MSM tool.
Remember the fastboot ROM will put OOS back on your phone. MSM will put OOS back on your phone and relock the bootloader. So not sure what you were trying to do but you may try and boot TWRP from fastboot one more time if thats what you were trying to do.
Click to expand...
Click to collapse
when ever i try to boot the immage it says "PS C:\adb> fastboot boot twrp-3.4.0-0-fajita-Q-mauronofrio.img
downloading 'boot.img'...
OKAY [ 0.723s]
booting...
FAILED (remote: Failed to load/authenticate boot image: Load Error)
finished. total time: 0.731s"
but i'll try to use the MSM tool
EDIT: doesn't seem to work either, same issue "Load Error"
The error means something is wrong, likely just one partition, but Ive never taken the time to figure out which one, just always fixed it with the fastboot ROM. I will say Im not a fan of the 3.4.x TWRP (for this device), I removed it from my LOS guide for several reasons. It still has issues in my opinion.
For the MSM tool, if it doesnt work its almost always a driver issue. Just for clarification for the MSM tool its not supposed to be in fastboot, nothing will be on the screen while using the tool (the phone starts off).
For reference, taken from my guide here:
Volume Up + Power while turning on will boot to fastboot.
Volume Down + Power while turn on will boot to recovery.
Holding Volume Up + Power should force the phone to turn off.
Volume Up + Volume Down should put your phone in Download mode for the MSM Tool.
OhioYJ said:
The error means something is wrong, likely just one partition, but Ive never taken the time to figure out which one, just always fixed it with the fastboot ROM. I will say Im not a fan of the 3.4.x TWRP (for this device), I removed it from my LOS guide for several reasons. It still has issues in my opinion.
For the MSM tool, if it doesnt work its almost always a driver issue. Just for clarification for the MSM tool its not supposed to be in fastboot, nothing will be on the screen while using the tool (the phone starts off).
For reference, taken from my guide here:
Volume Up + Power while turning on will boot to fastboot.
Volume Down + Power while turn on will boot to recovery.
Holding Volume Up + Power should force the phone to turn off.
Volume Up + Volume Down should put your phone in Download mode for the MSM Tool.
Click to expand...
Click to collapse
so i have successfully done the msm, but from here how do i enter stock os, because when ever i try to search for updates it says none found even though i am 9, is it because my oem is unlocked? or am i still rooted? whenever i try to update it using local upgrade it says fail
edit: just read that i should try to update to 9.0.17 and then to latest
OhioYJ said:
The error means something is wrong, likely just one partition, but Ive never taken the time to figure out which one, just always fixed it with the fastboot ROM. I will say Im not a fan of the 3.4.x TWRP (for this device), I removed it from my LOS guide for several reasons. It still has issues in my opinion.
For the MSM tool, if it doesnt work its almost always a driver issue. Just for clarification for the MSM tool its not supposed to be in fastboot, nothing will be on the screen while using the tool (the phone starts off).
For reference, taken from my guide here:
Volume Up + Power while turning on will boot to fastboot.
Volume Down + Power while turn on will boot to recovery.
Holding Volume Up + Power should force the phone to turn off.
Volume Up + Volume Down should put your phone in Download mode for the MSM Tool.
Click to expand...
Click to collapse
Heya, you sound really experience with regards to this so I was hoping you could save me some time by telling me if I should even bother wasting trying to revive my brick.
I've got a op7pro stuck on the bootloader unlocked screen. Research reveals I hosed it by flashing twrp to the wrong partition. Flashed it to boot instead of recovery.
I've tried to get MSMTool to recognize it by pressing volume buttons on powerup but it hasn't so far. That's pretty much the last resort isn't it? If MSM won't recognize it then I'm outta luck?
Device Manager will see my phone as an unknown device when I boot holding down the volume buttons, but MSMTool and the all-in-one tool won't.
The other time I unbricked using MSMTool I got it to work pressing volume buttons on boot and win10 immediately recognized the device as highspeed qualcomm ports.
But that was on a boot loop, this is stuck on bootloader, a far graver problem it seems. Thanks for whatever advice you could offer this hapless modder.
I'm trying to revive an old stock v20 with random reboot issues but I can't access download mode because the physical up volume button is broken.
The bootloader is unlocked and it is on software version 10k. I have access to ADB and fastboot - both working.
Is there a way to enter download mode with this disability or is there another way for me to upgrade the software to 10p, then 20h?
Info about h918 | LineageOS Wiki
wiki.lineageos.org
or as I assume:
Code:
adb reboot bootloader
I don't have this model.
Thanks for the quick reply. ADB reboot bootloader works for fastboot but not for download mode.
I was able to get the phone to reboot into download mode using Uppercut (LGUP did not work) and selecting upgrade with the 10p kdz. Once the install is finished I should be able to continue on with Lafsploit. I will report back with the results.
[SOLVED]
Okay so here is the workaround for this:
Use Uppercut to reboot the phone in download mode and unplug the cable just after the phone restarts. Now you have access to download mode and can connect the phone to another PC running FWEL for Lafsploit. After this you can boot into TWRP and flash normally