Geeetech

I have this board, on the back is printed "KEYS"
Any assistance in identifying this board would be greatly appreciated. I am trying to reload the firmware sine i have changed the thermistor and it no longer functions correctly.
I have tried the Repetier Firmware with no luck.
I am also trying Marlin ...

I have a Geetech i3 (i believe it is a c).
Where is the board identified?
I want to add a bltouch to this unit and want to know the correct board version (so i know i have correct information for firmware and pins)

Thank you for any assistance.