CrossRoads:
Carefully inspect the board. Any damaged traces? Any pins shorted to each other? Do the 5V and 3.3V levels measure okay at the power header? Is the Reset voltage at 5V?
Powered via usb 3.0:
Reset measures 4.81V
5V measures 4.81V
3.3V is exactly 3.30V
Powered by external 12V power adapter:
Reset measures 4.98V
5V measures 4.98V
3.3V is still 3.30V
No visible damage on both sides, just finished inspecting them with jewler's microscope.
I think I'm going to pass on this device and buy new one 