How To Open Fastboot Mode On Oppo A3s __full__ -

via USB cable.

Install/update OPPO USB drivers. Try a different USB port or cable. Use a USB 2.0 port on your PC. How to Open Fastboot Mode on OPPO A3s

To exit Fastboot mode on your OPPO A3s, simply type fastboot reboot to reboot your device. via USB cable