LG G6 - Fastboot boot loader error - unknown command

[NinoJaguar]

Hi,

I was trying to get the 'device id' to unlock the boot loader on LG G6 (h872g) with the fastboot command (fastboot oem device-id) however I keep on getting the "remote : unknown command" error.
"Fastboot devices" works and it shows my device being on a fastboot mode however non of the other fastboot commands works. I tried everything I possibly could including factory reset but i keep on getting the same error.
Any solutions of this problem anyone knows?
Is anyone else having the same issues?

Just to let you know, the "USB debugging" is on.

Appreciate the help.

Nino.

 

[ocnbrze]

can you post a screenshot of the commands you have tried?

 

[Brian706]

You said you enabled USB debugging but you didn't specify if you also enabled OEM unlocking in developer settings?

 

[NinoJaguar]

Hi,

i have uploaded the screenshot.

And yes the OEM unlocking in the developer setting has been enabled as well.
I tried multiple times restoring to the factory settings as well but its the same thing - kinda frustrating because it should generally work i thought.

Thanks.

 

[ocnbrze]

are typing in

adb reboot bootloader

before you get the device id?

the phone needs to be in fastboot mode for the command

fastboot oem device-id

to work.

 

[NinoJaguar]

Yah the device is in fastboot boot and i came to fastboot mode from that adb command.
It also shows the device with ADB DEVICES command.

Is there another way to find the device id ?

 

[ocnbrze]

Yah the device is in fastboot boot and i came to fastboot mode from that adb command.
It also shows the device with ADB DEVICES command.

Is there another way to find the device id ?

that's the only way that i found to get the id. just curious what model of the g6 do you have?

 

[NinoJaguar]

Yah it is H872g which is the T- Mobile version. Unless i can install different version and then those fastboot command works???

 

[ocnbrze]

Yah it is H872g which is the T- Mobile version. Unless i can install different version and then those fastboot command works???

if you go to the list of supported devices your model number is not listed:
https://developer.lge.com/resource/mobile/RetrieveBootloader.dev

most likely that is why you can not get the device id.

 

[NinoJaguar]

oh thats tragic.
Is it then possible to install h870 on mine which is European verson?
I tried it with LGUP downloading h870 rom file however it said invalid file. do you think there might be any possibility for that?
Or in general do you think there might be any other way to install custom recovery and custom rom on this model then?

Thanks.

 

[Masterchief87]

oh thats tragic.
Is it then possible to install h870 on mine which is European verson?
I tried it with LGUP downloading h870 rom file however it said invalid file. do you think there might be any possibility for that?
Or in general do you think there might be any other way to install custom recovery and custom rom on this model then?

Thanks.

Unlocking the bootloader is the easy part. You just type 'fastboot oem unlock' and that's it. The complicated part is flashing a custom recovery because apparently the version of fastboot that comes on the T-Mobile G6 doesn't support the 'fastboot flash ______ _______' command. Installing a custom recovery involves flashing the laf partition (download mode) from the h918 then booting fwul Linux from a USB stick and running a script that flashes your recovery to the laf partition, which finally allows you to root, flash roms, and install your custom recovery to the recovery partition. I got as far as unlocking the bootloader and flashing the laf partition from the h918 but the second step that requires using fwul Linux to install the recovery didn't work, for reasons which I don't yet understand. The phone still works fine but for the time being I've lost the ability to use download mode to flash a stock kdz firmware.

 

[Max Schuhmacher]

Unlocking the bootloader is the easy part. You just type 'fastboot oem unlock' and that's it. The complicated part is flashing a custom recovery because apparently the version of fastboot that comes on the T-Mobile G6 doesn't support the 'fastboot flash ______ _______' command. Installing a custom recovery involves flashing the laf partition (download mode) from the h918 then booting fwul Linux from a USB stick and running a script that flashes your recovery to the laf partition, which finally allows you to root, flash roms, and install your custom recovery to the recovery partition. I got as far as unlocking the bootloader and flashing the laf partition from the h918 but the second step that requires using fwul Linux to install the recovery didn't work, for reasons which I don't yet understand. The phone still works fine but for the time being I've lost the ability to use download mode to flash a stock kdz firmware.

Hey there, Masterchief87, were you ever able to figure this out? I have been trying to update mine and I got to the same point you did. Hate to bump an old thread, but this is the last lead I have found to root this thing / install twrp