/vr/ - Retro Games

I'm having huge amounts of bother putting custom firmware on a PSP model 1003.

It's currently on the official 6.61 firmware so I'm trying to downgrade it because no custom stuff seems to work on it right now.

I've tried using the Chronoswitch 7.0 downgrader,
Supposedly it goes PSP>GAME>UPDATE>eboot.pbp but for some reason that keeps showing up as corrupted on the memory card and won't launch the downgrader tool.
So then I tried PSP>GAME>Chronoswitch_7_0>eboot.pbp and the downgrader actually showed up where it's supposed to. But when I launch it, go through the warnings, it doesn't fucking work. I get a 'game could not be started' error and then I'm back at the home screen.

The annoying thing is I've done this before with my PSP slim, except that's still on the 6.60 official firmware so it was much less of a headache getting CFW on it.

I'm doing this for a friend who is much less tech savvy than I am. Help me out /vr/