If you need to pattern fix or dead boot on your Oppo A6 Pro 5G CPH2781 without an internet connection, you'll want to use tools like UFI BOX, Easy Jtag, Medusa Pro, MiPi Box atau Pandora Box, this phone has UFS 2.2 internal storage. You can use this same approach for other Oppo phones or any smartphone that Mediatek Dimensity 6300 chipshet. If you're not comfortable with scraping the UFS IC, you can always just lift the chip off the board.
Here are the UFS ISP pin labels you'll need to know:
Rst (this is for Reset), Txop (this is for Transmit Data Positive), Txon (this is for Transmit Data Negative), Rxop (this is for Receive Data Positive), Rxon (this is for Receive Data Negative), GND (this is for Ground – just connect it to any ground point on the device)
#extra tag
isp oppo A6 Pro 5G
ufs isp oppo A6 Pro cph2781
oppo A6 Pro 5G lupa pola
Isp Ufs Oppo A6 Pro 5G CPH2781
Oppo A6 Pro 5G CPH2781 Ufs Pinout