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How To] Downgrade Fat PS3 From 4.66 to 3.55 Firmware Using E3 Flasher Tutorial (Part 1 of 3) - YouTube
BT/Wifi not working with downgrade patch on 4.81, CECH-2501B · Issue #12 · Swizzy/PS3DumpChecker · GitHub
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Tutorial - E3 Flasher 4.81 Downgrade Tools/ Guide /Extract a PS3 Console ID | Se7enSins Gaming Community
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