Not really sure what you need more than 2 USB ports for anyway ... One for hard drive and one for PS3eye is all you need to play the game. Otherwise USB hubs works without any problems on PS3 as well, I've tested piles of them and I'm still to find one which doesn't work. Indeed if your hard drive powers solely from USB then it must be plugged directly into PS3 and camera via hub and it must support USB2. Alternatively use the hard drive with it's own / external power supply.
Is it an original JB? If not, you can simply remove it after PS3 will boot up. And if not, it should still work plugged into USB hub - with nothing else in at the boot time and then you'll plug hard drive directly into PS3 and camera into hub.
I thought it required a 3.50 update, although I may be getting that confused with a Dashboard update for the 360 when using a Kinect.
Hristinabamze, check the tutorials section for instructions on how to download and install a CFW. All you need to do is put the Kmeaw 3.55 CFW PUP file on a USB flash drive and update your console from the settings menu in the XMB. Then install the latest MultiMan and BDEUM.PKG (attached to the MM thread). You will be fine after that, no dongle, no power cycling, no nonsense.