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:

• Field Recovery Image is upgraded to runtime image version
• Bootloader is upgraded to 1.0.16
• Offline Field Diagnostics is upgraded to 0.9.28
• FPGA Revision version is upgraded to 1.7
• Environment Controller (MCU) Image version is upgraded to 1.8
• USB Console Revision version is upgraded to 2.2

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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René Jorissen

Co-owner and Solution Specialist at 4IP Solutions

René Jorissen works as Solution Specialist for 4IP in the Netherlands. Network Infrastructures are the primary focus. René works with equipment of multiple vendors, like Cisco, Aruba Networks, FortiNet, HP Networking, Juniper Networks, RSA SecurID, AeroHive, Microsoft and many more. René is Aruba Certified Edge Expert (ACEX #26), Aruba Certified Mobility Expert (ACMX #438), Aruba Certified ClearPass Expert (ACCX #725), Aruba Certified Design Expert (ACDX #760), CCNP R&S, FCNSP and Certified Ethical Hacker (CEF) certified. You can follow René on Twitter and LinkedIn.

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