I have a Chuwi Vi8 tablet. I would like to get into the bios. My understanding to do this is hold the volume up key and power key at the same time for about 5 seconds and it should go into bios. But when I hold those buttons on mine it just boots up, or gives me the windows and android icons to select which OS I would like to choose. Cannot get bios. I would like to do this because I am considering deleting the android OS, just have windows to give me more storage space on the drive.