Hey Rob after restarting the charging issue went away so I’m not concerned about the bios anymore. I can explain to you how I backed up the tablet tho. I saved my drivers first using the method at following link:
Windows 10 Driver Backup using DISM Command
Then I imaged the whole thing using macrium reflect free before removing the android partition and just installing windows. It worked well. I would like to make you aware that backing up the drivers or bios would not provide any personal info, however providing the whole disk image would include any personal files that you have created. Just wanted to make you aware of that so you don’t end up leaking any personal info.