//free\\ Download Ap3g2-k9w7-tar.153-3.jf15.tar -

Keep holding until the LED turns (usually 20–30 seconds), then release.

For the easiest recovery method, rename your downloaded file to ap3g2-k9w7-tar.default and place it in your TFTP root folder. The "Mode" Button Trick: Unplug the power from the AP. Hold down the download ap3g2-k9w7-tar.153-3.jf15.tar