if i remember right in the alpha 0.2 public release there was a bug with the usbd.irx files and dev modes. if you load from devolution mode ps2os it can't load the usbd.irx (from hdloader or cd it work correctly). now in the internal release this bug is corrected
Originally Posted by EspI69
ps2os betatester, ps2tools codev, hdldump frontend dev
6 sony mc w/ps2os 0.2.4, hdl, ps2rmp1.50,ps2mp3...
na+hd maxtor diamondmax 7200 120GB
PS2 SCPH-30004R V6 ÐM$3 V2 firm 2.4 B.4
PS2 SCPH-50003 V9 ÐM$4 PRO firm toxic os 0.1