Navigate to Commands > Upload File > Configuration and back up your current configuration file to your server. 2. Step-by-Step Firmware Upgrade Instructions
Failing to update your firmware exposes your network to vulnerabilities, bugs, and compatibility issues with newer access points or Cisco Prime Infrastructure. Conversely, a successful update can unlock new features, patch CVEs (Common Vulnerabilities and Exposures), and improve overall throughput.
Network Engineering Team Date: April 2026 Version: 1.0 cisco 2500 series wireless controller firmware update
> config ap image predownload primary enable
Introduced to minimize downtime, this allows you to download new firmware to the APs before rebooting the controller. The APs store the new image as a backup and only switch over once the controller reboots, significantly speeding up the overall network maintenance window. Wired Guest Access: Release 8.0 enabled the Navigate to Commands > Upload File > Configuration
Always export your current configuration via the Commands > Upload File menu in the GUI or via TFTP/SFTP in the CLI.
Type y when prompted to confirm the transfer and initiate the firmware decompression. 4. Activating the New Image and Rebooting Conversely, a successful update can unlock new features,
> transfer download datatype code > transfer download mode tftp > transfer download serverip 192.168.1.100 > transfer download path ./ > transfer download filename AIR-CT2500-K9-8-5-182-0.aes > transfer download start
For older versions, you may need an interim release. For example, moving from 8.0 to 8.5 often requires stopping at 8.3 first.
Login to your WLC and check the current image version.