Sony Rolled Out Firmware 4.81 for Its PlayStation 3 Console - Download Now
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PS3 System Update 4.81 Is Available Now To Download
PS3 4.81 exploit: IDPS Dumper released, and latest status of the exploit - Wololo.net
PS3: Official Rebug 4.81-REX/D-REX with COBRA 7.31 released - Hackinformer
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PS3 - 4.81 (OFW) Firmware Update Now Live !!! | PSX-Place
How to Jailbreak a PS3 (with Pictures) - wikiHow
Cómo hacer jailbreak a una PS3 (con imágenes) - wikiHow