Error 0x800f0831 for Cumulative Update KB5008212
answers.microsoft.com › en-us › windowsDec 21, 2021 · Error 0x800f0831 for Cumulative Update KB5008212. I've been trying to install the Cumulative Update for Windows 10 Version 21H2 for x64-based Systems (KB5008212) all day, and every time it fails with error 0x800f0831. In my attempts to fix it, I have: -rebooted. -downloaded the update from the download center and tried it (which also failed)