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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.
D.1 Overview
The Unified Extensible Firmware Interface (UEFI) provides a software-based interface
between the operating system and the platform firmware in the pre-boot environment. The
UEFI specification supports an architecture-independent mechanism that will allow the UEFI
OS loader stored in an add-on card to boot the system. The UEFI offers clean, hands-off
management to a computer during system boot.
D.2 Recovering the UEFI BIOS Image
A UEFI BIOS flash chip consists of a recovery BIOS block and a main BIOS block (a main
BIOS image). The recovery block contains critical BIOS codes, including memory detection
and recovery codes for the user to flash a healthy BIOS image if the original main BIOS image
is corrupted. When the system power is turned on, the recovery block codes execute first.
Once this process is complete, the main BIOS code will continue with system initialization
and the remaining POST (Power-On Self-Test) routines.
Note 1: Follow the BIOS recovery instructions below for BIOS recovery when the main BIOS
block crashes.
Note 2: When the BIOS recovery block crashes, you will need to follow the procedures to
make a Returned Merchandise Authorization (RMA) request. (For a RMA request, please
see section 3.5 for more information). Also, you may use the Supermicro Update Manager
(SUM) Out-of-Band (OOB) (https://www.supermicro.com.tw/products/nfo/SMS_SUM.cfm) to
reflash the BIOS.
Appendix D
UEFI BIOS Recovery
135
Appendix D: UEFI BIOS Recovery
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