Re-lock bootloader (H850)

[bornheim2]

I just wanted to report that I successfully re-locked my bootloader (did not find that here).

I have an H850 with GPS problems. To return it I wanted it to be as stock as possible.
I used TWRP to flash LG-H85010E-Flashable.COMPLETE.zip from Codefire. Back to unrooted.
I also tried to flash recovery.img from the same source. This seemed to work (no more TWRP), but did not allow for OTAs (update error 0x1125000).
Then I put the phone in download mode, started LG bridge and did the "Updatefehler korrigieren" thing (German, roughly translates to "correct update errors").
To re-lock the bootloader, I put the phone in USB Debugging mode and entered the following commands:

adb reboot bootlaoder
fastboot oem lock
fastboot reboot

The phone gets wiped by this, but you need to do the initial dialog again: enable developer mode, then go there an disable OEM unlock. After that do a factory data reset one last time.

 

[Pphish20]

You should contact @autoprime and have him add this to his all in one thread.
Thanks for the info!

 

[Hazard17]

@bornheim2
It's good to see that we have option to turn back to stock, and maybe send phone for warrianty repair. But I have one question... If you had tried to unlock phone once again, would You had to enter LG Unlock Code again?

 

[bornheim2]

If you had tried to unlock phone once again, would You had to enter LG Unlock Code again?

Obviously. The command to unlock is

fastboot flash unlock unlock.bin

which means you need to have the unlock.bin file available. You did archive the mail, didn't you?

 

[Hazard17]

Obviously. The command to unlock is

fastboot flash unlock unlock.bin

which means you need to have the unlock.bin file available. You did archive the mail, didn't you?

I haven't unlocked my phone yet, but it is important message for me.

 

[james1089]

Obviously. The command to unlock is

fastboot flash unlock unlock.bin

which means you need to have the unlock.bin file available. You did archive the mail, didn't you?

No I didn't archive the mail

 

[GNAzi]

I've got the same problem - seller deceived me and sold phone after water damage. My microphone stopped work and I should send it back. How to lock the bootloader on RS988 model?