I apologize in advance, but I couldn't easily find an answer to this question. I've found several guides for downgrading from 4.0 to 3.2, but they're for people who DIDN'T install a cIOS beforehand. I've got 4.0U upgraded via Waninkoko's installer, patched IOS60, Kwiirk's USB cIOS (202) and Homebrew Channel. I want USB2.0 capability in MPlayer-CE, but unfortunately I cannot install dvdx to IOS202, as the 3.4+ dvdx installer has no advanced options. UPDATE: Nevermind! As it turns out, if you've upgraded to 4.0 via Waninkoko's updater, you CAN still use the old dvdx installer, with advanced options. I Installed to IOS202, and it worked like a charm. Waninkoko's updater FTW!