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

Review of Cisco 5500 Series Wireless Controller:

Supports 802.11n/ac Wave 1 APs (e.g., 1700, 2700, 3700, 1570) but not Wave 2 APs (1800, 2800, 3800).
Check AP support matrix for 8.3.150.0 – many older APs (1240, 1260) are not supported beyond 8.0 or 8.1.

The Cisco 5500 Series Wireless Controller is a part of Cisco's wireless solution portfolio, designed to manage and control large-scale wireless networks. It supports up to 500 access points and 7,500 wireless clients per controller, making it suitable for large enterprise environments.

save config reload

GUI method:
Management → Software Upgrade → Download from TFTP/FTP → select file → Reboot after download.

Warning: Do not interrupt the upgrade; loss of power during image write can brick the controller.

While not a revolutionary feature release, this version polished several critical enterprise functions: air-ct5500-k9-8-3-150-0

If you plan to run this image in production for the next 3-5 years, follow these rules:

If you are running this today, you are exposed to high-severity vulnerabilities:

No fixes were back-ported to 8.3.150.0 because the train is obsolete. Review of Cisco 5500 Series Wireless Controller: Supports

If you are debating whether to stay on 8.3 or leap to 8.5, here is the reality check:

Verdict: If you do not need 802.11ax (Wi-Fi 6) APs, stay on 8.3.150.0. It is the last version that treats the 5500 series with respect. GUI method: Management → Software Upgrade → Download