Porsche Enthusiasts Club Forum

Hi,can anyone offer any advice? I've bought a chip for my 91 c4 and taken out the ecu to change the chip but have found there is two circuit boards mounted one above the other.I assume you have to remove the top board to get to the chip,if that's the case does anyone know how? The instructions are brilliant,remove ecu,prise off lid,install chip.Apparently it takes twenty minutes which is odd coz I've been staring at it for longer than that and still nothings changed.