Connect your phone to your PC while still inside TWRP. Copy your chosen ROM zip file (and Google Apps package, if not included) to the internal storage. In TWRP, go to the main menu and tap . Locate and select the Custom ROM zip file. Swipe to confirm the flash.
This refers to full ROMs built specifically for the Oppo A83 by its small community of developers. oppo a83 custom rom
Download and install the latest Android SDK Platform Tools on your computer to facilitate communication with your phone. Connect your phone to your PC while still inside TWRP
The progress bar crawled across the screen. Updating partition details... Updating system files... Locate and select the Custom ROM zip file
"I'm doing it," he whispered to his cat. "I'm unlocking the bootloader."
Maintain a battery charge of at least 60% to prevent the phone from shutting down mid-process.
Swipe to confirm the flash and wait for the process to complete.