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PS3 custom firmware installation (fat CECHA01, and slim CECH-2101A) - William Quade
PS3] Como saber se seu PS3 aceita Downgrade? - GameMod design
Downgradable PS3 Models - Wololo.net
Downgradable PS3 Models & Base Firmware with MinVerChk | PSXHAX - PSXHACKS
4.80 CECH-3004B Hackable? | GBAtemp.net - The Independent Video Game Community
How To Downgrade Your 4.90 CFW PS3 *Easy* - YouTube
How To Downgrade Your PS3 From 4.91 To 4.90! [HEN/CFW] - YouTube
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