AP55 EOL set up. Strange blinking

Hi, 

I got today two Sophos AP55 Accesspoints. 
The problem here is, I can not add in them Sophos Central. They wont appear there.
Also they blink green green green then short red and again. 
What does that mean? 
I even dont know how to even reset them or something else because I cannot find them anywere in the network. 
Can someone help me?