Second hand Pro2 cam does not sync with hub

[HaRo]

Both hub an cam work as designed, the cam just does not sync with the hub. 
I’ve bought the cam on eBay. Does the previous owner need to kind of „free“ the cam before I can sync it with my hub?

[JamesC]

HaRo,

What LED behavior are you seeing on the camera when attempting to sync? It sounds like there may be a hardware issue with the camera.

JamesC

[HaRo]

Hi, it‘s the expected behavior: after having the battery entered it is a short single blue sign. Then after pressing the connect button it does go on/off blue for some time (didn’t measure, but for sure about a Minute) and then fast on/off orange for 3-5 seconds and then off.