it's the same as you I'd to convert it to autonomous. Just download the recovery image and perform the same steps. If you console into the ap and hold the mode button down then power the ap up, while holding the mode button for 20 seconds and releasing the button, you will see from the output what filename you need to rename the recovery image.
You will tftp the same as you did when you converted that to autonomous.
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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