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UEFI BIOS Recovery Instructions
Warning: Do not upgrade the BIOS unless your system has a BIOS-related issue.
Flashing the wrong BIOS can cause irreparable damage to the system. In no event shall
Supermicro be liable for direct, indirect, special, incidental, or consequential damages
arising from a BIOS update. If you need to update the BIOS, do not shut down or reset
the system while the BIOS is updating to avoid possible boot failure.
C-1 An Overview to the UEFI BIOS
The Unifi ed Extensible Firmware Interface (UEFI) provides a software-based in-
terface between the operating system and the platform fi rmware in the pre-boot
environment. The UEFI specifi cation supports an architecture-independent mecha-
nism for add-on card initialization to allow the UEFI OS loader, which is stored in
the add-on card, to boot the system. The UEFI offers a clean, hands-off control to
a computer system at bootup.
C-2 How to Recover the UEFI BIOS Image (-the Main
BIOS Block)
A UEFI BIOS fl ash chip consists of a recovery BIOS block and a main BIOS block (a
main BIOS image). The boot block contains critical BIOS codes, including memory
detection and recovery codes for the user to fl ash a new BIOS image if the original
main BIOS image is corrupted. When the system power is on, the boot block codes
execute fi rst. Once it is completed, the main BIOS code will continue with system
initialization and bootup.
Note: Follow the BIOS recovery instructions below for BIOS recovery
when the main BIOS boot crashes. However, when the BIOS boot block
crashes, you will need to follow the procedures below for BIOS recovery.
C-3 To Recover the Main BIOS Block Using a USB-
Attached Device
This feature allows the user to recover a BIOS image using a USB-attached device
without additional utilities used. A USB fl ash device such as a USB fl ash drive, or
a USB CD/DVD ROM/RW device can be used for this purpose. However, a USB
Hard Disk drive cannot be used for BIOS recovery at this time.
Appendix C: UEFI BIOS Recovery
Appendix C
C-1
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