IBM RS/6000 44P 270 Service Manual page 306

ls /tmp/fwupdate/sx*.img
The update file name will have the format sxyyddd.img. The sx indicates that this is
a combined image for a Model 270 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/sxyyddd.img
Where sxyyddd.img is the name of the firmware image file that is in the
/tmp/fwupdate directory.
Notes:
a. Make sure that you include the periods (.) in the commands shown above.
b. 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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Service Guide
On some systems, the message Wait for rebooting before stopping