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i just transfered the savegame and linux file from the modded box to the usb memory card then to the unmodded box.
I have read where the exploit needs to be copied from the PC to the virgin Xbox. Using one from a modded Xbox doesn't work. You might try Krazie's and go from there. Slayer's is for a chipped Xbox. You shouldn't use it on a softmod unless you know exactly what you are doing.
Slayer's and your modded Xbox will have the MS Dash files on them.