If this has already been discovered, I apoligize in advance.
The Need For Speed Most Wanted UMD requires you update in order to play the game. I being curious, tried to change the firmware on the PSP via Xflash. I used the firmware spoofer, and tricked my PSP to think it was a firmware 2.0 PSP. The purpose of this was to see if I could load 2.0 UMDs, without Devhook. As I thought it was unsuccesful. GTA, SOCOM, Sims 2, Battlefront 2, all would not load. Finally I tried Need for Speed Most Wanted, and it worked. I was wondering why this was, and if other UMDs were susceptible to this method.
Thanks in advance.