Today mc707 has released EDecrypt v1.3, a Game Decryptor for M33 PSP Custom Firmware that allows some of the newer PSP game releases to now work properly.
PSP Titles supported include Elemental Monster TD Portable, Beam'Em Up, Puyo Puyo 7 and The Akuma Hunters among others.
Download: EDecrypt v1.3 Game Decryptor for M33 PSP Custom Firmware
How to use:
1. Copy EDecrypt folder to ms0:/PSP/GAME
2. Copy encrypted file(s) to ms0:/enc/
3. Execute EDecrypt v1.3 on PSP
4. Press X to decrypt file(s) or  to decrypt and patch file(s) for m33
• added many keys
• added 6.10 key
• patching routine
• logging to file ms0:/enc/done/log.txt
• multiple files processing
• added keys for 0xC0CB167C tag
• improved functionality
• added 6.0 FW keys
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