Time for more reading, Xtreme 2.5 is for Series 1 Tivos - you have a Series 2.
Start here : http://dealdatabase.com/forum/showthread.php?t=37434
I just purchased a Phillips DSR 704 from Ebay and I would like to install Xtreme Tivo on the unit with a 250gb Western Digital hard drive. I have already tried to install Xtreme2.5 with no success. What do I need to do or download and how to get it running? Any and all help would be awesome!