Yes, you can rename the files in FlashFXP. You should take a look at your BIOS with a tool like XBTool to see what its boot file names are. Otherwise, once you rename the MS dash xboxdash.xbe, that's what it will load first. In XBtool there are four places for the "order" of dashboard filenames. xboxdash.xbe is usually first, so if found, it will be loaded first. You would want to edit that to evoxdash.xbe to be first and xboxdash to be 2nd. Don't worry, cause the original BIOS only looks for xboxdash.xbe, so this will have no affect on booting the original BIOS.