Running mp4 videos on 2.6 ?

Hi,

all of my mp4 videos are showing up as "Corrupted Data" on my brothers 2.6 firmware PSP, I take it this is because of certain extra security in the update.

Is there any application that can be run through the Bock eBoot loader to view these video files?

Before anyone asks; yes they are in the correct place. They work fine on my 1.5, I simply put the memory card in his PSP to test it.

Thanks all!