the eMMc package wipes the hard drive and the firmware update cleans any program you had installed somewhere. Goto this site http://tablets-dev.nokia.com/nokia_N900.php and input your imei number and then you will be able to download the Vanilla eMMc package along with the latest firmware. You will see something to the effect of Vanilla eMMc. Flash the phone first with that image then do the firmware upgrade. You must do it in that order or the phone will act wonky. Using the Vanilla image wont mess up your phone. If you are brave enough to flash it yourself from the command line then this should not be a problem. You do the same thing you would when flashing the firmware. Just change the name to the vanilla package. Everything you need to flash your phone is there.