How To Open Fastboot Mode On Asus Rog Phone 3

Cause: You are in Fastboot, but the bootloader is locked. That’s normal. Fix: If you want to flash custom images, you need to unlock the bootloader first using fastboot oem unlock or the official ASUS Unlock Tool.

This is the most straightforward method, especially if your phone is powered off or frozen.

Step 1: Power off your ROG Phone 3 completely.
Wait 5–10 seconds to ensure it’s fully shut down.

Step 2: Press and hold the Volume Up button.

Step 3: While holding Volume Up, press and hold the Power button.

Step 4: Keep holding both buttons until the screen lights up with the ASUS logo, then release the Power button but continue holding Volume Up. how to open fastboot mode on asus rog phone 3

Step 5: After a few seconds, you should see a dark screen with small text — that’s Fastboot Mode.

Navigation: Use Volume keys to scroll, Power button to select. To exit, select “Power Off” or hold Power for 10 seconds.

This is the most reliable method to open Fastboot mode, especially if your phone is bricked, bootlooping, or won’t start Android normally.

Step-by-step instructions:

Success indicator: You will see a static screen with options like Reboot, Reboot to Bootloader, Power Off. Some versions show a black screen with white text listing partition info. This is Fastboot mode.

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.

adb reboot bootloader

This reboots the ROG Phone 3 directly into fastboot/bootloader. Cause: You are in Fastboot, but the bootloader is locked

1. It shows "Charging" instead of Fastboot: This is the most common mistake on ROG phones. If you see a battery percentage icon, it means you did not press the Volume Up button after the initial boot sequence. Turn the phone off and try the Hardware Button method again, ensuring you press Volume Up after the screen lights up.

2. The phone is not recognized by PC: If you are trying to use Fastboot commands on a PC and the device isn't detected, you likely need to install the ASUS Android USB Driver for Windows. You can download this from the official ASUS support website.

3. "Waiting for any device": If you see this message on your PC command line, ensure the USB cable is properly connected. If using Windows, check Device Manager to see if the phone appears under "Android Device" or "Other Devices."

The ASUS ROG Phone 3 is a beast of a gaming smartphone, but like any high-performance Android device, sometimes you need to step out of the standard operating system and into the bootloader. Fastboot Mode (also known as Bootloader Mode) is a diagnostic and engineering protocol that allows you to flash custom recoveries (like TWRP), unlock the bootloader, install system images, or fix bricked software issues.

If you own an ROG Phone 3 (ZS661KS) and need to access Fastboot, you have found the right guide. Below, we detail every possible method—from hardware key combinations to ADB commands—along with troubleshooting tips for common issues. Navigation: Use Volume keys to scroll, Power button