how to find my version of my ps2

[beave]

some one tell me how i find the version of my ps2. i bought the new external mod cube, and have two wires to solder in. i can't figure this out for the life of me, and i already opened it up, it doesn't look like either 1,2,3, or 4, and i don't know how to tell what version 5 looks like, so i tried to solder this wire in according to version4 cause it is quite close, i can't get the backup copies to load, is there something i am missing, and can't i just burn the patch of the game on my normal cd burn program? someone please help

beave