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How to Downgrade a PS3 to 3.55 with E3 Flasher (EASY!) - YouTube
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Downgrading Firmware - PS3 Developer wiki
SANY ilaya - UPDATE!!! PS3 4.50 OFW DOWNGRADE (hardware flasher method)/UNBRICK SERVICE for BRICKED PS3 due to FAILED firmware updates (see guide below) JAILBREAK: -Software: for firmwares 3.55 below (slim and phat) -
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JOGi MODS :: PS3 Downgrade Service - Back To 3.55 OFW
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How to Downgrade a PS3 to 3.55 with E3 Flasher (EASY!) - YouTube
How to Downgrade PS3 Slim to 3.55 using the E3 Flasher (The Easy Way) - YouTube
Downgradable PS3 Models & Base Firmware with MinVerChk | PSXHAX - PSXHACKS