Is the code on the chip a match for your ecu?

On my mk5 RS2000 I have a 1AGB ECU and the Superchip has to have a matching map flashed onto it.

If yours is ok, then it could be that the contacts need cleaning as they are usually coated with a thickish waxy substance. Carefully scrape and clean this off with the ECU removed from the car.

Does the car run ok with the Superchip removed?