I'm not really sure that it's a Firmware issue!!
As far as I'm aware Multiman should work on every Firmware!!
Are you sure it's Hermes 3.55?? I thought that he only made 3.41 CFW??
There would probably be a Spoof FW if it's showing 3.55??
Don't quote me on it I could be wrong!!
PS2 Consoles Owned:- DTL-T10000H with DTL-H10030 HDD, SCPH-30002, SCPH-30002R White with 80GB Seagate HDD S/N W0001988 of 2000 ever made from the Automobile Collection, SCPH-30003, SCPH-35002, SCPH-39002, SCPH-50002, Silver SCPH-50002, Aqua SCPH-50003, White SCPH-55006 GT with 40GB Sony HDD!!