From DD-WRT Wiki
For ver 3.x I bricked my wap54g when I followed the instructions
- Unplug power. Wait 15 seconds
- Press and hold Reset Button on WAP unit for 30 seconds, unplug unit, Plug back in still holding reset button an additional 30 seconds.
I suspect that this is either a bad thing to do if the device has acquired an IP already or the power cycling itself in this manner is damaging. I have been unable to get any response from the device in any way and it was working 5 minutes prior to this attempt with latest manufacturer firmware.
I would be more than happy to see if this can be recreated/resolved however the device suffered damage and need to fix the power plug on the PCB.