You don't need to search a Chuwi service in your town, but you can find a computer motherboard service center or laptop service center... God service must have a BIOS programmer device.... Download BIOS firmware for your tablet and send it to the service center.... Good engineers must be in your town!
perhaps someone could post an image of their whole emmc (sans personal info of course) so that those who altered their partitions could restore them to stock. Or perhaps emily might be nice enough to post a factory image of the emmc for all.
The product of the Chuwi Hi12 (window 10 only) has been discontinued. New version Hi12 （dualboot version）are sold now.
So you can only buy dualboot hi12 now. The single os Hi12 is no stock now. Thanks