Should I install Windows 10 first and then do a BIOS update or should I update the BIOS first? In your case it doesnt matter. Some instances an update is needed for stability of installation.

Do you have to update BIOS before installing Windows 10?

A System Bios update is required before upgrading to the this version of Windows 10.

Is it a good idea to update BIOS?

In general, you shouldn’t need to update your BIOS that often. Installing (or “flashing”) a new BIOS is more dangerous than updating a simple Windows program, and if something goes wrong during the process, you could end up bricking your computer.