PS3: Official Rebug 4.81-REX/D-REX with COBRA 7.31 released - Hackinformer
How To Jailbreak PS3 4.81 OFW to CFW? [Working]
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Playerkp420 4.81 CFW (Non-Cobra) PS3 Custom Firmware is Released | PSXHAX - PSXHACKS
PS3 System Update 4.81 Is Available Now To Download
Ferrox CFW 4.81 Eng
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Sony PlayStation 3 Firmware 4.90 Download | TechSpot