More bad new for PSP custom firmware users. Apparently, the upcoming Gran Turismo PSP will require you to have the latest firmware 6.00 installed before playing the game.
According to reports from TheSixthAxis, SCEA has given some lucky websites a voucher code of the game for them to review. The download weighs approximately 937MB and requires the latest PSP firmware 6.00 installed. Now this is not really a surprising move from Sony since most of their latest PSP releases required a mandatory installation of firmware 5.55 that came along with the UMD.
Gran Turismo PSP will be released October 1.