well obviously you can't FTP to your xbox when on msdash as it doesn't set up an FTP server... even if you did manage to upload jade empire to your xbox, how could you hope to run it from msdash?
what modchip do you have? are you sure its switched on? (do backup games still work?) perhaps its broken somehow so the box is booting msdash instead....
assuming your chip is still working and switched on, have you tried booting from an evox install disk? that would both set up an ftp server and allow you to reinstall evox.
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no2 vaporizer