The file is an Autonomous (Standalone) IOS image for Cisco Aironet access points, specifically for the 1600 series (indicated by "ap1g2"). The "k9w7" designation identifies it as the autonomous version, which does not require a Wireless LAN Controller (WLC) to function, unlike the "k9w8" lightweight images. Image Breakdown
Ap1g2-k9w7-tar.153-3.jf15.tar
if you are using the automated "Mode Button" recovery method. The AP specifically looks for this exact name during a forced TFTP boot. Cisco Community 2. Automated Recovery Method (Easiest) Power Down : Disconnect the power or PoE cable from the AP. Hold Mode Button : Press and hold the button on the back/side of the unit. : Reconnect power while continuing to hold the button. Wait for Amber/Red : Hold for about 20-30 seconds
Deploying this specific file is a common task for network engineers performing a "Recovery" "Conversion."
If your AP is currently in lightweight mode, use the Recovery Mode method to force the new image: : Unplug the AP's power or PoE. Hold Mode Button : Press and hold the MODE button on the AP.
ap1g2-k9w7-tar.153-3.jf15.tar is a specific firmware image file for Cisco Aironet access points, most notably the Aironet 1600 series (such as the AIR-CAP1602I-E-K9). Cisco Community File Breakdown