Cisco's firmware nomenclature may seem obscure, but it is highly structural. Breaking down ap3g1-k9w7-tar.153-3.jf15.tar piece-by-piece explains exactly what is being handled:

For detailed step-by-step guides on switching between modes, refer to the Cisco Wireless Software Management Guide .

: This is the most crucial designation.

: Indicates the file is a compressed archive containing the IOS image, radio firmware, and web GUI files.

The ap3g1 platform identifier means this firmware will work on the following:

The file ap3g1-k9w7-tar.153-3.jf15.tar represents a now-vulnerable Cisco AP firmware release. While functional, it lacks modern security patches and WPA3. Organizations still using it should prioritize upgrades. For researchers, it offers a rich target for IoT/embedded security training.

: You cannot do this via the web interface if the AP is currently in Lightweight mode. TFTP Server : Software like Tftpd64 running on your PC.