The ISO could be your problem,...
It's not only because of piracy not beeing supported here, why we suggest you to dump your ISOs from your originals...
It's also because of this very exact reason...
ISOs could be dumped incorrectly. Those ISOs might work on modchipped PS2s, because they simply look at the ISO-Filesystem, but here... ESR and the ESR-Patch are dependent on the UDF-Filesystem.
PS2 V7/DMS3 V2 (FW:2.4b7); Seagate Baracuda 200GB
PS2 V7/CC1.0 (FW:34 hacked v2 BM:2.1.6); Maxtor DiamondMAX9 PLUS 160GB
PS2 SCPH-30004R; NoMod+NoLaser
3xSony MC 8MB
MAX/Datel 16MB with Boot-CD
Custom FMCB 1.8b+ Beta-Build, my AIO 0.5, Sony&xRhino-Linux