The code upgrade procedure for the Cisco 2504 Wireless Lan Controller is not that different than the one for the Cisco 5520 described in details here. This time I will keep it short, simple and to the point.
Worth mentioning that the Cisco 2504 it is now EOL and will be supported by Cisco a few more years.
You should check the release notes and confirm your wireless access points are supported by this version of code.
You may also look at the compatibility matrix for Cisco Prime if you are using that. Some of the features might stop working and you’ll have no idea why.
