Appendix C: UEFI BIOS Recovery

C-1

Appendix C 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 Unied Extensible Firmware Interface (UEFI) specication provides a software-
based interface between the operating system and the platform rmware in the
pre-boot environment. The UEFI specication 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, hand-off control to
a computer system at bootup.

C-2 How to Recover the UEFI BIOS Image (-the Main

BIOS Block)

An AMIBIOS ash chip consists of a boot sector block and a main BIOS code block
(a main BIOS image). The boot sector block contains critical BIOS codes, including
memory detection and recovery codes for the user to ash a new BIOS image if the
original BIOS image is corrupted. When the system power is on, the boot sector
codes execute 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 block crashes. However, when the BIOS Boot sec-
tor crashes, you will need to send the motherboard back to Supermicro
for RMA repair.

C-3 To Recover the Boot Sector 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 ash device such as a USB Flash Drive, or