After succesfully loading Gta with the mph loader I decided to give socom a shot, firstly using an original iso:- loader states loading game, screen goes blank and after a short while psp shuts down. So tried decrypting prx (although socom was created before 2.00) Firstly I had to I had to rename the prx file to prx_2.0 and its sub folders in order for the dycrpter to work, as with gta the decrypter created .dcr files.
To cut a long story short the game loads as it does with previous loaders as far as the at loading campaign screen goes

wondering if anyone else has had any luck