This is the standard way to enter Fastboot (also known as Bootloader Mode) without a computer. : Press and hold the button and select Button Combo : Once fully off, press and hold the buttons simultaneously. : When the Bootloader menu appears on the screen, release both buttons.
In the next menu, navigate to and select using the same buttons. Method 2: ADB Command (Computer Required) how to open fastboot mode on asus rog phone 3
Opening Fastboot mode on the ASUS ROG Phone 3 is straightforward once you know the correct technique. The works every time, even if the OS is corrupted. For convenience, the ADB command adb reboot bootloader is your best friend on a working phone. This is the standard way to enter Fastboot