Ap3g1-k9w7-tar.153-3.jf15.tar _top_

The boot variable is pointing to an old file. Interrupt boot (Ctrl+Break at startup) and set correct BOOT variable:

. It is primarily used to manage and configure Cisco Aironet 1530 and 3500 series wireless access points without requiring a central Wireless LAN Controller (WLC). Anatomy of the Filename ap3g1-k9w7-tar.153-3.jf15.tar