ASUS P9X79LE User Manual

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Chapter 2: Hardware information

USB BIOS Flashback allows you to easily update the BIOS without entering the BIOS or 

operating system. Just connect the USB storage device containing the BIOS file to the USB 

port, press the BIOS Flashback button, and the BIOS is updated automatically.

1.  Do not disconnect the USB flash drive or power system, or move the CLRTC jumper 

during the BIOS updating process. Doing so will interrupt the BIOS updating process. 

In case of interruption, follow the steps again to update the BIOS.

2.   If FLBK_LED flashes for five seconds and turns into a stable light, this indicates 

that USB BIOS Flashback is not working properly due to improper USB flash drive 

connection, BIOS file name error, or incompatible BIOS file format. If this happens, 

restart the syetem.

3.  BIOS updating poses some risks. If the BIOS program is damaged during the updating 

process and the system fails to reboot, please contact your local ASUS Service Center 

for assistance

1. 

Download the BIOS CAP file from the ASUS website at www.asus.com and save it to 

the root directory of your USB flash drive. Rename the CAP file to P9X79LE.CAP

2. 

Connect the USB flash drive to the bottom USB12 port at the rear panel.

3. 

Press the USB Flashback button for three seconds until the FLBK_LED flashes. The 

FLBK_LED goes out when the BIOS update is completed.