use Cisco-certified firmware specific to the
model that you are using. You can download new releases of the firmware for all
supported server models from Cisco.com.
To avoid potential problems, we strongly recommend that you use
the Host Upgrade Utility (HUU), which upgrades the CIMC, BIOS, and other
firmware components to compatible levels.
detailed information about this utility, see the "Upgrading Firmware" chapter
Getting Started Guide for
Cisco UCS E-Series Servers and the Cisco UCS E-Series Network Compute
This chapter also provides information about the compatible HUU, CIMC, and BIOS
The HUU is
supported on CIMC, release 2.1.0 and later releases.
If you choose to upgrade the CIMC and BIOS firmware
manually—instead of using the HUU—you must update the CIMC firmware first, and
then the BIOS firmware. Do not install the new BIOS firmware until after you
have activated the compatible CIMC firmware or the server will not boot.
The CIMC firmware
update process is divided into the following stages to minimize the amount of
time the server will be offline:
Installation—During this stage, CIMC installs the
selected CIMC firmware in the non-active, or backup, slot on the server.
this stage, CIMC sets the non-active firmware version as active and reboots the
server, causing a disruption in service. When the server reboots, the firmware
in the new active slot becomes the running version.
After you activate
the CIMC firmware, you can update the BIOS firmware. The server must be powered
off during the entire BIOS update process. Once the CIMC finishes rebooting,
the server can be powered on and returned to service.
You can either
upgrade an older firmware version to a newer one, or downgrade a newer firmware
version to an older one.