There are several ways to see your BIOS version from within Windows, and they work the same on PCs with a traditional BIOS or a newer UEFI firmware.
To check your BIOS version from the Command Prompt, hit Start, type “cmd” in the search box, and then click the “Command Prompt” result—no need to run it as an administrator.
Here’s how to check what BIOS version your computer is using and flash that new BIOS version onto your motherboard as quickly and safely as possible. If your computer freezes, crashes, or loses power during the process, the BIOS or UEFI firmware may be corrupted.
This will render your computer unbootable—it’ll be “bricked.” Your computer’s BIOS version is displayed in the BIOS setup menu itself, but you don’t have to reboot to check this version number.
They work together and they're both important, but they are not the same thing.
Let's take a look at what the BIOS and CMOS are, and how they're different.
Some motherboards, including most modern ATX motherboards, will continue to provide power to the CMOS if the battery is replaced while the computer is powered on.
Then it locates and runs your boot loader, or loads your operating system directly.If you purchased a pre-built computer instead of building your own, head to the computer manufacturer’s website, look up the computer model, and look at its downloads page. Your BIOS download probably comes in an archive—usually a ZIP file. Inside, you’ll find some sort of BIOS file—in the screenshot below, it’s the E7887IMS.140 file.The archive should also contain a README file that will walk you through updating to the new BIOS.Visit your motherboard manufacturer's support website if you need to download a new copy of your manual.You probably shouldn’t update your BIOS, but sometimes you need to.