Go to Settings > About Phone. Tap "Build Number" 7 times. Go back to Settings > Additional Settings > Developer Options, and toggle on "USB Debugging". Method 1: Using Hardware Keys (No Computer Required)
To force the device into Fastboot mode, type the final command and press Enter: adb reboot bootloader how to open fastboot mode on oppo a37 verified
If your physical buttons are damaged or non-responsive, you can trigger Fastboot Mode from a computer: How To Enter Fastboot Mode On Umidigi A3S Go to Settings > About Phone
Simultaneously press and hold the Volume Up and Power buttons. how to open fastboot mode on oppo a37 verified