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Question: How do I update my BIOS under UEFI Shell?
Note: We do not recommend that you update your BIOS if you are not experiencing a
BIOS-related problem. If you need to update your BIOS, please follow the steps below
to properly update your BIOS under UEFI Shell.
1. Download and save the BIOS update package to your computer.
2. Extract the files from the UEFI folder of the BIOS package to a USB stick.
Note: The USB stick doesn't have to be bootable; however, it has to be formatted with
the FAT/FAT32 file system.
3. Insert the USB stick into a USB port, boot to the UEFI Built-In Shell, and enter the following
commands to start the BIOS update:
Shell> fs0:
fs0:\> cd UEFI
fs0:\UEFI> flash.nsh BIOSname#.###
4. The FLASH.NSH script will compare the Flash Descriptor Table (FDT) code in the new
BIOS with the existing one in the motherboard:
a. If a different FDT is found
•
A new file, STARTUP.NSH, will be created, and the system will automatically reboot in 10
seconds without you pressing any key. BIOS will be updated after the system reboots.
•
You can also press <Y> to force an immediate system reboot to shorten the process. Dur-
ing system reboot, press the <F11> key to invoke the boot menu and boot into the build-in
UEFI Shell. Your BIOS will be updated automatically.
b. If the FDT is the same
•
BIOS update will be immediately performed without a system reboot initiated.
Warning: Do not shut down or reset the system while updating the BIOS to prevent possible
system boot failure!)
5. Perform an A/C power cycle after the message indicating the BIOS update has completed.
6. Go to the BIOS setup utility, and restore the BIOS settings.
Chapter 3: Troubleshooting
77
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