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Noob Tutorial: How to downgrade/flash your PS3 SLIM from firmware 3.70 to 3.55 via ProgSkeet/Teensy++ and install 3.55 Kmeaw CFW - PS3/PS4 Anleitungen - xboxhacks.de - Deutsches Xbox 360 und One Forum
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) -