2 ps1 but game enhancer work only on one.

[ihaveanosebleed]

You didn’t really say what you were trying to do. Are you trying to run cheats or boot a backup? If backup, are you trying the same CDR on both PSX’s or did you try more CDR’s? If you only tried the same single backup on both PSX’s, it could be that the laser on one PSX is weaker than the other and better quality media/burns are needed for the weaker PSX laser.