Same thing, locate your dash.
Put XBMC in the E:\Apps folder. You should have E:\Apps\Xbmc with default.xbe in there.
Using the shortcuts in the _tools folder I believe of XBMC on the PC you rename the default.xbe in the dash to unleashx.xbe. You then FTP shortcut......xbe to the dash folder and rename it default.xbe. You do the same with shortcut.......cfg, renaming it default.cfg.
When you reboot you should have XBMC as the dash.