IBM eServer pSeries 610 6C1 Installation Manual page 136

After the firmware update file has been written into the /tmp/fwupdate directory,
verify its existence by entering the following command:
ls /tmp/fwupdate/cc*.img
The update file name will have the format ccyyddd.img . The cc indicates that this is
a combined image for the server, yy is the last two digits of the year, and ddd is the
Julian date of the update file.
4. After the update file has been written to the /tmp/fwupdate directory, enter the
following commands:
cd /usr/lpp/diagnostics/bin
then
./update_flash -f /tmp/fwupdate/ccyyddd.img
Notes:
a. ccyyddd.img is the file you identified in the previous step.
b. Make sure that you include the periods (.) in the commands shown above.
c. AIX commands are case-sensitive. Type them exactly as shown.
You are asked by the system for confirmation to proceed with the firmware update
and the required reboot. If you confirm, the system applies the new firmware,
reboots, and returns to the AIX prompt. This may take up to ten minutes, depending
on the configuration of the system.
Attention:
may appear on the system display. Do not turn off the system unit until the system
has fully rebooted to the AIX login prompt. If a shutdown is necessary at that time,
log in as root user and issue the shutdown command. While the update is in
progress, you will see Rebooting... on the display for as long as three minutes.
The firmware update is complete.
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Installation Guide
On some systems, the message Wait for rebooting before stopping