ok heres what i did.
1. Download the DG from here. and extract it
2. Follow the readme. (obvious I know)
3. when it gets to something about a creating a DXAR file. skip it and download Excruciation X's pack as it already has the created DXAR file.
4. put X's files in the GAME folder.
5. Run the updater, make sure you have 75% battery or the downgrader won't run, and it needs to be plugged into the AC Adaptor.
6. WATCH lol. its pretty cool to watch it.
7. DOWNLOAD ALOT OF HOMEBREW.

there. that should help. if you need anymore help, just post here and i'll help. or you can PM me