This goes way back in my archives but hopefully all you should really need to do is modify it for your TFTP server address and image name.
Follow the steps below to reload the access point image using the CLI. When the access point begins to boot, you interrupt the boot process and use boot loader commands to load an image from a TFTP server to replace the image in the access point.
Step 1 Open the CLI using a Telnet session or a connection to the access point console port.
Step 2 Reboot the access point by removing power and reapplying power.
Step 3 Let the access point boot until it begins to inflate the image. When you see these lines on the CLI, press Esc:
If you do not press the spacebar to continue, the process eventually times out and the access point stops inflating the image. Repeat until done inflating the files.
Step 8 Enter the set BOOT command to designate the new image as the image that the access point uses when it reboots. The access point creates a directory for the image that has the same name as the image, and you must include the directory in the command. Your entry might look like this example:
ap: set BOOT flash:/c1200-k9w7-mx.123-7.JA2/c1200-k9w7-mx.123-7.JA
Step 9 Enter the set command to check your bootloader entries.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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