Support full 480 x 272 widescreen format? I remember at one time they didn't, and that is where the custom firmware came in. I bought a PSP Slim today packed with 3.60, and until I can downgrade I am stuck with it.
If it does, what would be the best PSP converting program? I previously used 3GP, imo it's the best but I don't think it supports true widescreen for the non cf.