T-Mobile LG G5 on stock Oreo (H83030c)

[subaron]

Is there a way to install a custom ROM on a LG G5 running stock Oreo? Can the stock firmware be downgraded to one of the stock nougat builds to help with bootloader unlock and TWRP install?

 

[Nick8228]

Is there a way to install a custom ROM on a LG G5 running stock Oreo? Can the stock firmware be downgraded to one of the stock nougat builds to help with bootloader unlock and TWRP install?

Yes, you can downgrade 30c to 20a, then unlock bootloader and install TWRP.

 

[htc420]

Is there a guide on how to do this? Thanks

 

[subaron]

I never found a solution to this and ended up getting a new phone. But that new phone just brokeand I am back to using the LG G5 again.

So now I am looking for a way to downgrade to 20a and the files needed to unlock the bootloader.

Appreciate any help provided.

 

[ROMSG]

I never found a solution to this and ended up getting a new phone. But that new phone just brokeand I am back to using the LG G5 again.

So now I am looking for a way to downgrade to 20a and the files needed to unlock the bootloader.

Appreciate any help provided.

Here this should help
https://www.youtube.com/watch?v=EOwYONhW0xE

 

[Aethera]

I never found a solution to this and ended up getting a new phone.

Hi subaron what version are you on now? If you are on the latest 30C then you need to downgrade to 20A stock ROM first.

You must download the 20A kdz file and flash it with UPPERCUT. Then you enable Developer Options and can follow the info in this thread on how to install TWRP recovery and root. The only thing different from those directions is: instead of SuperSU, install Magisk.

Once you have rooted 20A with TWRP installed, then you copy the 30C COMPLETE .zip to the sdcard, reboot into recovery, and install that and install Magisk once again.