Re: FlyBook VM. An error after upgrade the BIOS.
I would roll that BIOS update back. See if you can find the old BIOS and reinstall it. If the issue goes away then there has to be an issue with the BIOS. If the issue continues you know it isn't the BIOS update that cause the problem.
1. if issue is resolved by rolling back the bios to the older version then just stick with the older version, probably not a ton of gain by using the new bios
2. if issue isn't resolved, then maybe look for some type of short caused by the power cable. Probably nothing within the power cord causing the issue, but on the power connector on the MB, which would require either soldering a new connector or replacing the MB, both of which are a pain to do.