BIOS update for Novatech Barebones system

I have a Novatech Barebones system box (System Model BB-44308B) bought way back in the mists of time and running Windows 7 quite happily until recently.
I decided to bite the bullet and upgrade to Windows 10, but the upgrade failed. Googling the issue tells me that one of the most common reasons for this is that the BIOS needs to be updated - which I confess I haven’t done since I bought this system box.
Current BIOS is American Megatrends Inc F4, dated 14/08/2013

Where can I get the most up to date version from please?

And more importantly, how do I identify which is the correct version to use?

Based on information you have provided your system is fitted with a Gigabyte GA-H81M-S2PV Rev1.0 Board.
The latest BIOS update for this board is F9 and can be downloaded from the following link

You can then use BIOS Q Flash utility to update BIOS. See this link for more information on Gigabyte Q Flash Process

If in any doubt about the process involved please speak directly with our Technical Support team for assistance