What would be a more "sane" approach is to flash to the firmware made for the make
and model that you have.
There is a sequence for the regular jetBook upgrades and you may need to flash to
an earlier one, before you flash to the current one. The "sticky" at the top of this
forum should have all that you need.
If you can get to the diagnostic screen, you should reflash the NOR memory and Restore
to Factory Settings, then do your firmware updates.