With USB Debugging active, connect the OPPO A5 2020 to a computer (Windows or Linux) via a USB cable. On the computer, you need the ADB and Fastboot platform tools installed. Open a command prompt or terminal window in the folder containing these tools and type the command:
adb reboot bootloader At this moment, the phone’s screen will go black and then… typically stay black. This is the most confusing part of the process. On the OPPO A5 2020, Fastboot Mode does display a visible menu or text on the screen. The screen remains off, but the device is actually in a functional, albeit headless, Fastboot mode. You can verify this by typing the command fastboot devices on your PC. If the computer returns a serial number, the phone is successfully in Fastboot, despite the blank display. To exit this blank state, you must hold the power button for 10–15 seconds to force a normal reboot. How to Open Fastboot Mode on OPPO A5 2020
adb devices Your phone will display a prompt asking you to authorize the computer’s RSA key—tap "Allow." Once the device is listed as "device," enter the decisive command: With USB Debugging active, connect the OPPO A5