Then most likely that is the reason it didn't work. I don't remember if I had wiped the system partition the first time tried flashing the original but definitely wiped it later on. I also tried to resize it to gain some space since installing gapps wasn't possible. I also have no idea which firmware I originally had since I didn't do a backup.When you flashed official, did you wipe the system partition or just flashed the ROM? The first post in the thread says that the recommended ROM Firmware Required is V18.104.22.168.PDCCNXM. I don't see such recommendation for this LOS unnofficial build, and that's probably why this one is working fine.