Air-ct5500-k9-8-3-150-0 May 2026

| Feature | | 8.5.182.0 (Later release) | | :--- | :--- | :--- | | AP Support | Up to 3800 (Wave 1 stable) | 4800, 9100 series (Wave 2) | | Memory Usage | ~512 MB (Stable) | ~1.2 GB (High) | | Web GUI Speed | Fast (Java-free HTML5) | Slow (Heavy AngularJS) | | Recommended for? | Legacy 5508, High uptime | Newer 5520, Feature testing |

Download the image, validate the MD5 checksum (Cisco’s site provides it), stage it in your lab, and deploy with confidence. 8.3.150.0 is the definitive end-of-life image for the 5500 series. Keywords: Cisco AIR-CT5500-K9-8-3-150-0, 5508 WLC upgrade, AireOS 8.3, Cisco wireless firmware, 5500 series end of life. air-ct5500-k9-8-3-150-0

In the evolving landscape of enterprise wireless networking, firmware and software versions are the unsung heroes—or villains—of stability and performance. For administrators managing a Cisco 5500 Series Wireless LAN Controller (WLC), a specific alphanumeric string often dictates the difference between seamless roaming and a help desk nightmare: air-ct5500-k9-8-3-150-0 . | Feature | | 8