Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 
Community Member

Upgrade FUS WLC 2504

Hi all,

Eh updated the firmware of my WLC 2504 (FUS) from 1.0.0 to 1.8.0 
I can again upgrade from 1.8.0 to 1.9.0 ?

I have read that is recommended once the upgrade of FUS. It is true?

Everyone's tags (1)
Cisco Employee

Hi, yes, you can upgrade the



yes, you can upgrade the firmware again from 1.8 to 1.9.

it's recommended to upgrade the same firmware version only once.

The FUS upgrade will take approximately about 30 minutes and it will reboot the WLC several times.

it's advised to upgrade once the FUS because the WLC reboots and sometimes they will see that the FUS has not upgraded and upgrade again instead of waiting for 30 to 45 minutes.

However, you can wait for the upgrade of FUS on the WLC to 1.8. once the WLC is stable you can upgrade the FUS again to 1.9.

Hope this helps.




Here is the FUS release notes

Here is the FUS release notes for 1.9.0 and you can download and upgrade image.

Cisco Employee

Yes , you can upgrade and

Yes , you can upgrade and below are the upgraded components for 2500 Series :

 •Field Recovery Image is upgraded from to

•Bootloader is upgraded to 1.0.20

•Offline Field Diagnostics is upgraded from 0.9.28 to 0.9.35

Please refer to the Release Notes :

CreatePlease to create content