It may sound sad but..
Since you're on 4.30 firmware..
There is no way to jailbreak/mod your PS3 unless you buy a FLASHER like Progskeet or an E3.
E3 is most durable because it is a solderless FLASHER.
After that, just look on this site
You must login or register to view this content. this site includes all the homebrew and all the latest Custom and Modded firmwares to date. [Keep in mind there is also a 'CFW' which would work on all OFW, but that was an april fool'
Good luck mate.