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You need to spoof your console ID to a valid one first, use PSID Patch 4.41 DEX or 4.46 CEX, these are the working ones for REBUG 4.46 CEX-DEX and include the console ID on a FAT32 USB in last port to PS3, launch the PSID patch, Press L1 and it'll sign in if the ID is unique and working.