Try this version on the 3.55 you would see a unknown usb device message
It's too help my research and to have the possibility to exploit it on every firmware. My next test, i don't know, still need to keep working on it, this is just a partial testing that can lead.. remember that the PS3 only load what the system recognize
Ok good luck with you endeavour!!! I am always willing to test for you on slims 3.55, 3.72, and 4.00 but please be gentle with the 3.55. I would be willing to risk a brick on the 3.72 or 4.00 if you ended up thinking it would be worth the gamble.