I did the same thing once. Here's what you have to do. 3 wire trick won't work.
1. Get the homebrew chip with the 4979.06 bios on it from www.pcmerc.com for 13.00.
2. Solder it up with the switches like the directions on the site say, and make sure that you solder the points so that you disable the write protection.
3. Boot up your xbox with that bios, and make a boot disk containing the evox.ini and xboxdash.xbe from the evox 3595 dash (or similar) (also, you might have to rename it to evoxdash.xbe)
4. Set up your FTP on your dash and your computer.
5. Copy those 2 files onto your xbox harddrive.
6. If your box is a v1.0 or 1.1, make the new bios that you downloaded from xbins 1GB, if v1.2 - v1.5 make it 256k using xtools. Make a folder called BIOS and put your newly resized bios (I'd use 4979.67) into that folder.
7. Turn of your xbox.
8. Reboot your xbox with the chip on.
9. Turn the chip OFF. Make sure that it is set to off, and not on.
10. Go to system utilites on the dash, and select bios.
11. Flash the TSOP using the 4979.67
12. Thank Wargod for his knowledge and wisdom!
