CUCM v11+ allows the removal of old or unused device firmware easily. It’s a good practice to clean up unused device firmware after completing system upgrades or after succesful completion of device pack installs or individual device firmware installs.

Browse to the OS Administration page and navigated to Software Upgrades -> Device Load Management.

Search the ‘Status’ column for the keyword ‘Not’. This lists all device firmware not is use.

Select the Select All button (top left), then select Delete.

You do get a grace warning message.. Click ok to continue.

And now you are just left with device firmware that is currently in use.

Make sure to repeat the above process for all Subscribers in the Cluster.