Just wanted to say that I originally had a bone stone X930BT that was running pre 3.000 software and firmware... don't remember which lol, but I updated from that straight to the 4.0 firmware using these instructions and backed it all up to an sd card using supertestmode.
As a side note, regular testmode would not allow me to copy, but supertestmode would and did allow me to copy and backup my user folders and such. This method works perfect and it took about 30 minutes using a pretty fast microsd card including the bluetooth update which took about 5 minutes to finish and had me worrying