ps 2 back ups dont work plz help me

[highlife74]

i had a mod chip installed in two different ps2 systems one works good but the other one freezes up only with the ps2 back ups originals work fine and ps1 back ups work fine also. thanx 4 the help
ps: i found a way to load ps2 ea games with out the 4 sec. swap if u r intrested let me know i will post it. thanx again

You can boot a EA game without a patch??...and whats that othger swap method...do u use a patch???