Business WLAN | NWA5121-ni cant be reset or accessed

Hi

I have a NWA-5121-ni which is stuck in managed by AP-controller mode. At least that is what the LED says.
I blinks 3 times slowly then goes black and start all over again,
SInce the LED is never ON so then it is impossible to reset it to factory default, I guess.
I have tried to reset without any luck.
AP is not accessible on default ip-address or any IP....

Thanful for any ideas..

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