Fastboot Mode Asus ROG Phone 3 , you can use a hardware button combination or an ADB command from a computer. Method 1: Hardware Button Combination
If you entered Fastboot mode accidentally or wish to return to normal operation: how to open fastboot mode on asus rog phone 3
Note for ROG Phone 3 users: Unlike older ASUS phones, the ROG Phone 3 does not use the Volume Down + Power combo for Fastboot. Volume Down usually leads to Recovery Mode (stock Android recovery). Always use Volume Up + Power. Fastboot Mode Asus ROG Phone 3 , you
You can now use Fastboot commands to flash firmware, kernels, and other system files. Solution: You are releasing the Volume Up button too early
Power Off: Press and hold the Power button and select Power off to shut down the device completely.