If you downgrade from 8.3 to 8.2 or earlier, certain 802.11r FT (Fast Transition) configurations will be invalidated and reset to "FT disable".
: This image is designed for the Cisco 5500 Series Wireless Controllers, specifically the 5508 and 5520 models. It is not compatible with other controller models, like the 2504 or the virtual vWLC, despite some online queries to the contrary. Attempting to load this image on unsupported hardware could result in boot failures or unstable operation. air-ct5500-k9-8-3-150-0
Maintains support for a wide range of Aironet Access Points, ensuring that older legacy systems can continue operating without requiring a full infrastructure upgrade. Core Capabilities of the Cisco 5508 WLC (Running 8.3.150.0) If you downgrade from 8