Air-ct5500-k9-8-3-150-0 [top] Jun 2026

The 8.3.150.0 release is often cited in community forums because it served as a critical "bridge" or "safe harbor" version:

Upgrading the Cisco 5500 series WLC can be done via GUI or CLI. The following is a general guide using the GUI.

This release ensures that your wireless network remains secure, responsive, and reliable, protecting your infrastructure with proven Cisco technology. air-ct5500-k9-8-3-150-0

: Do not rename the AP_BUNDLE file – the controller looks for the string “AP_BUNDLE” in the filename to avoid accidentally overwriting the backup image.

If you are running a version earlier than 8.0, you may need to perform an intermediate upgrade. : Do not rename the AP_BUNDLE file –

After the download finishes, reboot the controller. If you need the supplementary AP bundle, repeat the same steps with the bundle filename.

For the running software version 8.3.150.0 , the most comprehensive resource is the Cisco Wireless Controller Configuration Guide, Release 8.3 . This version introduces significant updates, particularly for fast roaming and Apple device integration. Essential Documentation & Guides If you need the supplementary AP bundle, repeat

Using a TFTP server (ensure the MD5 hash matches Cisco’s portal to avoid corruption), initiate the transfer via the controller’s CLI:

Released around 2019, this version is part of the , which Cisco designated as a "Long Lived Release." This means it was prioritized for stability and security rather than just new experimental features. Critical Upgrade Precautions

From Cisco.com → Software → Wireless → 5500 Series Controller → choose version 8.3.150.0.