Did you read my post? I stated what slayers was and what tool you use to format the HDD. Evolution X has commands you can send via ftp to format the HDD. Slayers has options that will do it for you (i believe). It is a menu app that you load up and select what you want to do.
Anyways, the evox bios has nothing to do with the dashboard other than the fact that they were created by the same droup. The bios is put onto the modchip, the dashboard is put onto the hard-drive. The bios is what lets you load unsigned code, or apps that MS did not approve. The dashboard is the menu you get when you turn on your xbox. I am pretty sure that slayers will format the Hard-drive.
On a side note, I would not use the evox bios as they are old. What version of the x2 lite modchip do you have?
1. Install modchip
2. flash bios (i prefer ftp)
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http://www.teamxecuter.com/flashbios/
3. burn evox (or slayers) to a disk and load it up
4. ftp to the dashboard and backup the C and E drive to your PC.
5. use the option in evox (or slayers) to unlock your hdd
6. power off and swap HDD's
7. load evox and format via ftp or use slayers and just choose the menu option to do it
8. reboot and ftp to the dash.
9. send back the C and E drive that you backed up