This might be completely irrelevant, but I decided to post it anyway, just in case anyone had a similar experience or if someone know a way to install SOCOM II with HDLoader.
I tried installing a patched .iso of SOCOM II (PAL) and it wouldn't work once installed. At that time, I didn't know it wasn't compatible, so I tried enabling Mode 3. It booted on to the title screen and then the PS2 sort of rebooted and went to the Browser disc menu.
Having seen the title screen make me decide to try more mode combinations, none of which really helped. Then, in the end, I put the game back in mode 3 and I don't have a clue how, but it booted perfectly. I played for a couple of hours with no problems or whatsoever.
Needless to say I haven't managed to boot it ever since. The only thing I remember is that I had changed the memory card for one which still had enough space for saves and that I was moving the joystick and mashing the buttons of the controller the time that the game booted correctly. I don't know if that could have had any influence...
Does anyone have any comments about this?