CREATING AN EVOX BOOT DISC FOR TESTING
The first thing you should do when creating an EvoX boot disc is be sure that the XBE file is named default.xbe and not evoxdash.xbe. Also, you may want to configure the evox.ini file to your liking and include the BIOS folder with your choice of BIOS images if you plan on flashing. If you are burning to DVD-R, the disc should boot without issue. However, if you are using a CD-R/RW, you may want to include a dummy file of approximately 250MB - 600MB. This can be any file as long as it is large and named something like "0dummy" to ensure that it will come before the EvoX files on the disc. This helps the Xbox boot the CD-R/RW as the read rate near the outside of the disc (where the EvoX data would be pushed to by the dummy file) is much faster near the inside, so rereads do not result in disc timeouts. Regardless of your media, this should be made into a GDF ISO and burned to disc, being sure to use TAO (Track-At-Once) or DAO (Disc-at-Once). It will then boot EvoX, and you can FTP the files that you want to put on the Xbox hard drive(remember to backup the xboxdash.xbe on the Xbox at the start).
Credit to explicitlyrics100 to this contribution