( http://forum.chuwi.com/forum.php?mod=redirect&goto=findpost&ptid=1160&pid=4123&fromuid=926 )
READ THIS: Make very SURE you have the correct BIOS for your device. Flashing the wrong BIOS WILL BRICK your device and make it unbootable.
CHECK AGAIN
1. Get an empty USB thumb drive.
2. Format USB drive FAT32, name it WINPE
3. Extract all files and then Copy all the files from the BIOS .rar onto the USB drive. Your USB drive should look like the picture below all files at the root directory.
If your BIOS is already set to boot USB thumb drive as 1st prioroty, then the deivce will go directly to step 5 automatically
4. Boot into BIOS boot manager using F7 key
5. Select and Boot the USB thumb drive
6. New BIOS will be flashed
7. Remove the USB drive once BIOS flash is complete. If you leave it in, then BIOS will be flashed again on boot.
New bios for dual OS Chuwi Hi 12 (pass: en.chuwi.com)
https://www.dropbox.com/s/he2iob6v9z8k7nf/Lateset%20Dualboot%20Hi12%20BIOS%EF%BC%88remain%20KEY%2C%20solve%20wifi%20disconnet%20issue%29.rar?dl=0