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PS3 4.81 exploit: IDPS Dumper released, and latest status of the exploit - Wololo.net
PS3 Firmware Archives - XTREME PS
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Sony PlayStation 3 PS3 160GB System Fat Console CECHP01 BluRay 4.81 De
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PlayStation 3 System Software Update 4.89 : Brandon Michael Hafer, Sony Interactive Entertainment : Free Download, Borrow, and Streaming : Internet Archive