Special delivery... yeah! New Games now playable again :)
You need to be in 5.50 GEN-D3 and above in order to update this
5.03 = 5.03 Prometheus-4
5.50 = 5.50 Prometheus-4
2) Unpack the RAR file (I have added 10% recovery record incase) and move the WHOLE FOLDER to :ROOT\PSP\GAME.
3) Go to your PSP XMB (main menu) and update to the new firmware.