Alright, here's the skinny. I have this old, busted PSP-2000 that I need to take apart and fix. That's not the problem.

The problem is that I need to upgrade it with CFW. I know it's been hacked before, with what I believe was 5.00 M33 CFW. Now it's version 6.10 Official, because my friend borrowed it and upgraded it officially to play Dissidia Final Fantasy (which needs at least 5.50 OFW to play).

I started reading McKinney's guide to brick down the PSP. I don't have Liberty City stories, so I know it's not going to work. Besides, my PSP has been modified before.

So do I have to downgrade my PSP again before upgrading it with CFW? And if so, what is the latest CFW I can use that will run CWCheat?