For a considerably faster response use www.smartxx.com/forums
1. Install the modchip
2. Replace HDD
3. Boot up XBox
4. Format HDD from the bios
5. LOCK HDD
But you will need to put the software back on, things like the original xbox dashboard and such.
Forget the Evox BIOS, it's old and tired, instead use the X2-5035 bios, much better all round, do remember that the SmartXX is a chip, so you still need a hacked BIOS to boot all the homebrew and such.
For further info on usage of the SmartXX trip over to the forums mentioned above, find a post from me and click the usage manual link in my sig.