i found a erst ecu in me boot today, had blue/red/black on it, took the back off and it has black marker on two of the chips, it had been apart before cause all the paper screw covers were missing, no manufacturer/tuner stickers on the inside either, what do you guys think or how can i find out?
Jt

 

could try it

if it will let you run more than 10psi its chipped