glad to hear that. but actually, the real problem here is not the microsoft's windows 10 copy, the reason why you cant install any images is because chuwi created their own win10 (which we called custom image)
designed for a specific tablet like vi8+,. as you can see, you can never use hi10 custom image on vi8+ or in hibook or in hi8.. BUT ITS POSSIBLE TO BYPASS this. and you can freely install any win10 version or even windows 8/8.1 both x86 and x64 bit architecture,, and you could even fully reset your tab and update them without getting any error. If you manage to install chuwi's vi8+ win10 then try to fully reset it, I tell you youll be in trouble afterwards. that's because its a custom image and they (chuwi) wanted it that way.
On the other hand, Flashing bios is wrong if there's no problem to it. unless you need to because of some feature or whatever valid reason you may have..
anyway, I'm really glad you found a way to get back things normally on your vi8+ tab.