Asus M5A99FX PRO R2.0 Manual page 66

For more BIOS update utilities in BIOS setup, refer to the section Updating BIOS in
Chapter 3.
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Do not unplug portable disk, power system, or press the CLR_CMOS button while
BIOS update is ongoing, otherwise update will be interrupted. In case of interruption,
please follow the steps again.
If the light flashes for five seconds and turns into a solid light, this means that the
BIOS Flashback is not operating properly. This may be caused by improper installation
of the USB storage device and filename/file format error. If this scenario happens,
please restart the system to turn off the light.
Updating BIOS may have risks. If the BIOS program is damaged during the process
and results to the system's failure to boot up, please contact your local ASUS Service
Center.
Chapter 2: Getting started