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every time i try to install a kiosk firmware wether it be 4.11 or 4.20 it will install perfectly fine from reecovery mode, and at the end it will restart and the ps3 logo comes up and it system update in the top left and then in the center it says Scanning... Please wait and it never changes

help pleasee im on a Ps3 fat
Update:
Now i dont think i can use my ps3, my ps3 wont update to 4.20 OFW

HELP MEEE!!!