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Cisco Air-CT2500-K9-2-0-0-0-FUS.AES: A Comprehensive Overview

The Wait: The controller will appear to "hang" or stay at a blank console for long periods while the FPGA is being programmed. This is normal. air-ct2500-k9-2-0-0-0-fus.aes

Field Upgrade Software (FUS). It is required to support newer runtime software versions (typically AireOS 8.x and above) and to enable compatibility with newer Access Point (AP) models, such as the Cisco Aironet 1815 series. Version History: Cisco Air-CT2500-K9-2-0-0-0-FUS

Official documentation and release notes are available on the Cisco Support website to pair with this FUS release? It is required to support newer runtime software

Some users have reported specific issues after moving to the 2.0.0.0 FUS, such as legacy Access Points (e.g., Aironet 1142) failing to negotiate full bandwidth (e.g., getting stuck at 20MHz instead of 40MHz) on certain later firmware versions like 8.3.150.0. Cisco Community Licensing and Support End-of-Life:

Impact: The WLC will be offline for approximately 45 minutes. Expect multiple reboots during the process.