I had exactly the same thing happen.
I cut apart the connector to see what was soldered where.
It boils down to this.
Pins 1 & 2: Purple
Pin 3: Green
Pin 4 & 5: Gray
Pin 6: White Green
Pin 7: Orange
Pin 8:White Orange
Pin labeled + :Green Purple
Pin labeled - : Blue Purple
I don't know what the plus/minus is as that's not anywhere near standard RJ45 wiring.
I tried several variation of standard punch down and couldn't get the camera to work.
If you do get it to work, please post. I have a dead camera I'd like to resurrect.