In TWRP, tap , navigate to the custom ROM file, and select it. Tap Add more Zips and select the GApps package. Swipe to confirm the flash.
Then, he flashed the GApps package. Finally, he wiped the cache one last time. oppo a83 custom rom
This was the easy part. The hard part was the tool. OPPO didn't officially support unlocking the bootloader easily back then. He had to use a third-party tool he found on a sketchy Indonesian tech forum. His antivirus screamed at him, but he disabled it. He was in too deep. In TWRP, tap , navigate to the custom