note: if this was already posted please delete this thread.
I found a possible exploit for the 2.0 firmware. Using the PBP unpacker, the program that is required with Fijinta's loader, you can edit the .SFO files or parameters so that they act like an update, it starts as a 1.51 update template but you can change it to 2.01 update template. That way, and putting the EBOOT.PBP file, with the correct and edited PARAMETER.SFO file, under PSP-GAMES-UPDATE it will start, but I still haven't found the way to make them run properly.
If some knows more about this please feel free to share your knowledge here.