You wouldn't actually be using Slayers 2.5. Its a package for setting up an entire harddrive. All you will need is the C partition from that package which includes the 4920 Dash. Follow these steps (assuming you have FTP access to Xbox):
1) Download Slayers 2.5 from ftp(torrent) or irc(full)
2) Copy the entire contents of your C drive from Xbox to your PC as a backup
3) Run the Slayers 2.5 which will extract a number of files, including the .ISO file which we're interested in
4) Download and install Craxion 4.0 from ftp
5) Load Craxion and select Extract ISO from pop-up menu. Select to slayer ISO file and then point it to any directory on your PC for extraction
6) After having backed up your Xbox C drive, delete the C drive contents through FTP access
7) Copy the contents from Slayers' \SYSTEM\ALL\C to your Xbox C drive

Reboot Xbox