is generally understood to be within the (limited support) train. The 8.5.182.0 version is often considered the final stable "legacy" version, though some newer interim images were released before EoL.
However, this doesn't mean you're entirely out of luck. Understanding the precise firmware version your hardware supports, the critical pre-upgrade requirements, and the legitimate channels still available can help you successfully obtain and install the right firmware.
After the WLC reboots, the firmware update is not "done" until you verify it. cisco wlc 2504 firmware download work
Do not download 8.10.196.x or 8.11.x. The 2504 will fail to boot due to certificate expiration and image signing changes.
Here is an in-depth look at what the firmware download work entails. is generally understood to be within the (limited
Even with an expired support contract, your Cisco.com account may still have download access if it's properly associated with the original purchase contract. To attempt this approach:
The 2504 That Wouldn’t Wake Up
The 2504 uses a base license for 5, 25, or 50 APs. Sometimes, firmware resets the evaluation period.