It seems to me that Chuwi should separate the instructions for flashing the bios and the instructions for reinstalling Android and Windows, because people think that the bios NEEDS to be flashed, and they brick their devices. 
True. In the old forum I repeated hundreds of times that the published Bios are not updates of the existing ones and that they correspond to new Bios of new versions of the same tablet model and that they should not be updated.
Unfortunately, these warnings are not heard and there is also the widespread custom of just receiving the new device, flashing the Bios (more than once with the wrong files) and reinstalling the system, with the result of brick in many cases.
I believe that Bios should not be available to users for this reason.