The keyword refers to a specific Cisco IOS software image used to convert Cisco Aironet 3500 and 1260 series
: Used to convert "Lightweight" access points (which require a controller) into "Autonomous" mode or to upgrade existing standalone units. File Naming : Designates the hardware family (e.g., Aironet 3500). : Indicates the Autonomous feature set. 153-3.jf15 : Represents the specific IOS version, 15.3(3)JF15. Compatibility Ap3g1-k9w7-tar.153-3.jf15.tar Download -
Does he discover a in the operative list? Ap3g1-k9w7-tar
archive download-sw /overwrite tftp://<tftp-server-ip>/ap3g1-k9w7-tar.153-3.jf15.tar
show version.