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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.
D-1 Overview to UEFI BIOS
The Unified Extensible Firmware Interface (UEFI) specification 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 for add-on card initialization to allow the UEFI OS loader, which is stored
in the add-on card, to boot up the system. UEFI offers a clean, hands-off control to
a computer system at bootup.
D-2 Recovering the UEFI BIOS Image (Main BIOS Block)
A UEFI BIOS flash chip consists of a recovery BIOS block, which is comprised of
two boot blocks and a main BIOS block (the main BIOS image). The boot block
contains critical BIOS codes including memory detection and recovery codes for
the user to flash a new BIOS image if the original main BIOS image is corrupted.
When the system power is on, the boot block codes execute first. Then the main
BIOS code will continue with system initialization and bootup.
Note: Follow the BIOS recovery instructions below when the main BIOS boot
crashes.
D-3 Recovering the UEFI BIOS with a USB Device
This feature allows the user to recover a BIOS image using a USB device without
the need of additional utilities. A device such as a USB flash drive or a USB CD/
DVD ROM/RW can be used. A USB hard disk drive cannot be used for BIOS
recovery at this time.
To perform UEFI BIOS recovery using an attached device, follow the instructions
below.
Appendix D UEFI BIOS Recovery Instructions
Appendix D
D-1
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