How to Flash ASUS Zenfone and ROG Phone Firmware Using ASUS Flash Tool
Technician guide to flashing ASUS RAW firmware on Zenfone and ROG Phone devices using ASUS Flash Tool in Fastboot CSC mode to restore stock factory partitions.
Pre-Flight Checklist
Complete ALL items before proceeding. Skipping any step increases the risk of bricking your device.
Guide Steps
Install ASUS USB drivers on your PC. After installation, reboot your computer.
Right-click ASUS Flash Tool.exe and select Run as administrator.
In the Model dropdown list in ASUS Flash Tool, select your exact phone model (for example, ZS660KL or ZS673KS).
Confirm the selection matches the hardware designation printed on your device packaging or fastboot screen.
Click the Browse (folder/box icon) next to the firmware file field.
Navigate to your downloaded ASUS .raw firmware file and select it.
Select Wipe Data: Yes to perform a clean factory restore (essential for bootloop recovery).
Power off your ASUS handset completely.
Press and hold Volume Up + Power simultaneously until the Fastboot / CSC mode screen appears.
Connect the phone to your PC via a USB 2.0 port. In ASUS Flash Tool, your device serial number and connection status will display in the device table with a blue icon.
Highlight your connected device in the list and click Start.
ASUS Flash Tool flashes all system, boot, vendor, and modem partitions in sequence.
Upon completion, the status changes to green/success and the handset automatically reboots into Android setup.
Congratulations! Flash Successful!
You've successfully completed all steps. Your device should now be running the new firmware. If it's booting normally — you're done! Check the troubleshooting section below if you encounter any issues.
Troubleshooting & FAQ
Common errors and their solutions. Read this before asking for help.
No. Official ASUS RAW firmware packages are digitally signed by ASUS and are flashed through Fastboot CSC service mode. They restore factory locked devices without needing an unlocked bootloader.
Verify the device is in Fastboot / CSC mode. Check Windows Device Manager to ensure "ASUS Android Bootloader Interface" is listed without yellow warning icons. Try a USB 2.0 port directly on the motherboard.
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