SubaReubs7

Hey there, I've got a 1995 Subaru WRX STI with some mods. I've recently purchased a Link ECU online, unaware of the mapping but will be mapped and tuned to suit my build. It's been plugged in and car won't run. Previous owner said it ran in a V1-V2 wrx. It's a Possum Bourne Link WRXROADR ECU but it has K7 as the ECU type on the casing which I can't find any info on (was previously running a chipped Z4 ecu). It's a 4 pin connector and plugs in fine but the connectors are grey whereas the other 4 pin ECU's I have are yellow connectors. Maybe just needs to go to a link specialist to map it to suit? Any advice is appreciated, cheers