Flash TWRP by typing: fastboot flash recovery twrp.img (replace "twrp.img" with the actual name of your downloaded file). Reboot into recovery using: fastboot boot twrp.img . Step 2: Wipe the Stock Firmware Once inside TWRP recovery, tap on . Select Advanced Wipe .
To help you get started on modifying your device safely, tell me: Oppo A9 Custom Rom
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