How to fix
Windows update error 0x800f0845
on Windows

Hi. How can I fix Windows Update error 0x800f0845 when installing KB4056892? Thanks!

Although the Error Code 0x800f0845 falls into the category of Windows 10 update errors, it’s not a regular one. It means that it cannot be fixed by resetting Windows Update components or restarting Windows update service.

The 0x800f0845 error mostly shows up when installing Windows 10 Cumulative Update KB4056892 (16299.192),[ref en-1] although it can also appear during the installation of other patches, such as KB4103721.[ref en-5] The former is an emergency update for AMD and Intel systems to immunize the Meltdown and Spectre vulnerabilities.[ref en-2]

Since the beginning of January, 2018 Microsoft, along with AMD, Intel, and ARM manufacturers, are working hard to fix the severe design flaw, which exposes a wide range of PCs, phones, tablets and servers to attack.

Actually, Windows 10 update KB4056892 is the one that should address the issue. The update has been released and pushed as one of the automatic Windows 10 updates.

Unfortunately, thousands of AMD systems encountered an endless boot loop once the system attempted to restart to finish up installing the KB4056892 update.[ref en-3] The others reported a BSOD error, which indicates the fact that the update failed to install with an error code 0x800f0845.

The KB4056892 update bugs were reported to Microsoft, which reacted immediately[ref en-4] by scaling back the rollout of the Windows patches both for Windows 7 and 10.

Enter Safe mode to uninstall Windows Updates

The company provided an official workaround to fix 0x800f0845 BSOD for those who have already installed the KB4056892 update and the system got stuck at boot. In this case you should try these steps:

• Try to reboot Windows for several times in a row. Failed reboots will start an Automatic Repair.
• In the Automatic Repair Window, select Troubleshoot -> Advanced Options (note: you might have to click See more recovery options to view this setting).
• Then open Startup Settings and click Restart.
• Now click F4 or 4 to access Safe Mode.
• When in Safe Mode, press Windows key + I to open Settings.
• Open Update & Security section and click Windows update.
• Now select the KB4056892 update from the update history and click Uninstall the update.

Use Windows Update Troubleshooter

Troubleshooter is an excellent Windows built-in tool that is capable of finding issues with particular module. Make use of the feature by following these instructions:

• Right-click on Start button and pick Settings
• Go to Update & Security > Troubleshoot
• Click on Windows Update and select Run the troubleshooter

  

Download Windows updates manually

In some cases, downloading the appropriate update manually can help users fix 0x800f0845 error. Please follow these steps:

• Go to the official Microsoft update catalog;
• Enter a specific update code, for example, KB4481031
• Select the correct version and click Download
• Click on the link and Windows will update your computer

  

Roll back the update on Repair Your Computer window

If you cannot access Safe Mode, you can fix 0x800f0845 error on Repair Your Computer screen. This method will work on Windows 10 and 7 PCs.

• Press F8 at Windows startup to open Repair Your Computer screen.
• Open Command Prompt and paste the following commands into it. NOTE: press Enter after each of them:
  • dir d:
  • dism /image:d:\\ /remove-package
  • /packagename:Package_for_RollupFix~31bf3856ad364e35~amd64~~7601.24002.1.4 /norestart

By the way, Microsoft explained the reason why some of the AMD systems did not accept the KB4056892. Microsoft’s spokesman reported: 

Some AMD chipsets do not conform to the documentation previously provided to Microsoft to develop the Windows operating system mitigations to protect against the chipset vulnerabilities known as Spectre and Meltdown.