PS3 4.81 exploit: IDPS Dumper released, and latest status of the exploit - Wololo.net
PS3 - 4.81 FERROX + COBRA 7.50 Custom Firmware by Alexander | PSX-Place
Playerkp420 4.81 CFW Cobra 7.3 PS3 Custom Firmware is Released | PSXHAX - PSXHACKS
Got all this for 90CAD. It's on version 4.81. My FAT PS3 is on 4.84 REBUG. FAT PS3 won't let me sign into PSN until I update...does another CFW exist or should
PS3: Official Rebug 4.81-REX/D-REX with COBRA 7.31 released - Hackinformer
Rebug 4.81.1 REX for PS3 CFW Installation - YouTube