Sony’s latest PSP firmware — firmware 6.60 — has been cracked wide open, which doesn’t really surprise me. In a futile attempt Sony again changed up their keys — keys that handle the encryption/decryption routines for said firmware — and those keys are now present in Psardumper, letting you dump/decrypt 6.60 in its entirety.
You can thank some1 and Proxima for this Psardumper release; neur0n also, who has readied a beta version of CFW 6.60 ME. But because 6.60 ME is not an official release just yet, I’ll ask you download it here if you’re interested. Note: You must be using a current HEN or CFW to activate and it’s for PSP-1000/2000 only