Umm, don't mislead the guy, Vanilla = eMMC If you flash the COMBINED image, /home won't be altered (though /home/opt will), so your contacts will remain intact. Flash the eMMC image if you want to clean /home I also suggest you follow the wiki, maemofanatics or other blogs may not have up to date tutorials. http://wiki.maemo.org/Updating_the_tablet_firmware