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

This fully overwrites the lightweight image.

Solution: The boot variable is pointing to an old file. Interrupt boot (Ctrl+Break at startup) and set correct BOOT variable: ap3g1-k9w7-tar.153-3.jf15.tar

ap: set BOOT flash:/ap3g1-k9w7-mx.153-3.jf15/ap3g1-k9w7-mx.153-3.jf15
ap: boot

This file can be used with a TFTP server during bootloader recovery to install a full IOS. This fully overwrites the lightweight image

It is critical to understand that 15.3(3)JF15 is End-of-Life (EOL) . Cisco announced the End-of-Support (EOS) for AP3600 on October 31, 2020. Consequently: Solution: The boot variable is pointing to an old file

Should you still run this firmware?

Access points running 12.4(25e)JA or 15.2(2)JB often suffer from memory fragmentation and SSLv3 vulnerabilities. Moving to 15.3(3)JF15 stabilizes the CAPWAP control plane and enables AES-256 CCMP for WPA2-Enterprise.