: Once the OPPO logo appears or the screen flickers, release both buttons.
Once you are in Fastboot Mode on the OPPO F9:
This is normal for OPPO F9. The screen may turn off entirely, but the phone is still in Fastboot. Connect to your PC and type fastboot devices . If you see a device, ignore the black screen. Proceed with your flashing commands blindly. How to Open Fastboot Mode on OPPO F9
A: Hold the Power button for 15 seconds until the phone vibrates and reboots. Or type fastboot reboot from your PC.
Use this method if your phone is currently powered on and you have a computer. : Once the OPPO logo appears or the
, you can either use a (Power + Volume Up) or an ADB command from a computer . Fastboot Mode is a diagnostic tool used to flash firmware, unlock bootloaders, or troubleshoot system issues when the standard Android OS isn't loading. Method 1: Using Hardware Key Combination
Because the OPPO F9 uses a MediaTek processor and ColorOS restrictions, you will likely see the following when you connect to a PC ( fastboot devices command): Connect to your PC and type fastboot devices
: Go to Settings > About Phone > Tap Build Number 7 times. Then, in Developer Options , enable USB Debugging .
A: No. Fastboot is a hardware-level mode. Apps cannot boot you into Fastboot; they simply execute the same adb reboot bootloader command under the hood.
After testing all possible methods, here is the ranking of reliability:
: Press and hold the Volume Up and Power buttons simultaneously.