Today I upgraded a FUS image on a Cisco WLC 5500 controller, because I also upgrade the WLC software to 7.2.103.0. The FUS upgrade is straightforward and comparable to a regular software update. The only difference is that you need console access to perform the upgrade. The FUS image upgrades the following components:
During the upgrade process you have to confirm to proceed the upgrade, like shown below
Checking for Field recovery image upgrade
Field Recovery Image upgrade …
Upgrade Field Recovery Image from version 6.0.182.0 to 7.0.112.21
Are you sure you want to proceed (y/N) ? y
******************************************************************
* Please make sure POWER SUPPLY is always ON during this period. * ******************************************************************Erasing Flash (estimated 49 seconds) …
Writing to flash (estimated 716 seconds) …
This happens multiple times and the controller reboots several times during the upgrade. It took about 20 minutes for the complete upgrade of the FUS image.
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