this is not so hard at all...
install chip
install HD
boot slayers
format
install MS dash
reboot to XOS
lock HD
take out chip
bask in virgin xbox glory
load game save
boot game
open save
flash
or you can flash right from evox by renaming the xboxdash.xbe with the evox files from the game save, that will accomplish the same thing, only it will boot evox when its unmodded. find the flashing tsop with lpc modchip thread in the stickies.
you DONT need the old HD for anything... throw it out
you CANT flash the tsop from an lpc modchip
you SHOULD use XOS to lock the HD