Windows update KB4577671 slows my 5Ghz wifi network

[Jacob1185]

When I install the KB4577671 update package, by 5Ghz wifi speed decreases dramatically. Usually its around 400 Mbps, after the update it is only allowing around 30-40 Mbps. The bad thing is I cant uninstall the update package. I had to wipe my computer and reinstall windows 10 and "hide" the update. Is there anyone who knows why this would slow my wifi speeds so dramatically?

[#2]

Hi,
Have you tried reinstalling your WiFi network adapter drivers after update?

also you seem to be using old version of Windows 10, the latest version is 19042 or 20H2.
you can update from here: https://www.microsoft.com/en-us/software-download/windows10