Greetings,
Welcome to the forum.
I am not a HP employee.
There is a BIOS update for your PC tied to Windows 7 (Link). This update is version 1.55 Rev. A, dated July 2018.
SoftPaq BIOS updates are OS dependent. But, if you read Installation Instructions options exist to install this BIOS update using USB or CD media. It is also possible to install this update using DOS. These two update methods would bypass the OS limitation you are facing.
Regards