Following the 4.83 Official Firmware update for the PS3, not only did it close the PS3Xploit's for installing CFW on 4.82 and also the HAN Exploit, but it also means its time for a round of Custom Firmware updates for excising CFW user's. So if your first experience on CFW was on 4.82 on your on 4.82 CFW, then all you do is update to a 4.83 CFW...
4.83 FERROX (w/ COBRA v7.55) CFW by Alexander