In Windows, you can find the relevant details within the system information. The current version of the software should be displayed here. Once you’ve gathered all this information, you can now look for the right update files. They are usually available on the website of the mainboard manufacturer. Make sure you find the correct version. In some cases, the various versions only differ by a single digit or letter in the name.
After downloading the corresponding files, you should store them on a USB storage medium. A simple USB stick can be used for this. The files are often located in a ZIP archive. You should unpack them before starting the update. Besides the file, you’ll also typically have a text file that contains important information about the update. It’s definitely advisable to read this text before continuing so that you ensure the new version is actually able to resolve your issue.