. You dont have to flash the bios, but most likely you will want to do something with your xbox other than stare at the cromwell screen. Flashing is very easy, just get the bios you want on a cd, and put it in when you're at the cromwell screen. Opening up the xbox is very easy, just make sure (as you should in any case when working with electronics) you are grounded (no static electricity) and read the tuts
really if you dont want to mess with soldering get the x2.3b lite plus, i'm getting one on the 7th for my dads xbox, I presume it will be much easier than a no nothing about soldering guy like me trying to get d0
(but I got it!
)