Hey Caml, this is what I did. I had evox on my hard disk, so I burned a dvdr of the new Evox with all of the bios, skins etc (it's 4.7 gig so you can even have boxplorer and the whole c: backup on there). I left the evox dash on there, just changed the name, and reinstalled msdash (renaming it the xboxdash.xbe). So when the xbox boots it goes to the original dash, bit scared of nuking it by accident. Then when i want to back up a game, the evox dvdr is used and I can ftp. The new version of evox lets you open the tray without it resetting.
You can even leave the apps on the xbox harddisk and the menu.ini on the dvdr will load the appz up fine. Just can't have evox dash (unless other bios are used). Also make sure that the menu.ini has the correct ip address otherwise it won't connect to your PC. (I also ran the evox DVD in media player b6, to make sure that it was working.)
I just dragged the menu.ini onto the dvdr. Hope this helps.
And thanks opjose, thought that was the case. I read the other previous posts more carefully and it made more sense.