Windows & BSOD · high

How to fixWU-0x800f0922

Windows Update Error 0x800f0922

What this error means

Windows Update Error 0x800f0922 (WU-0x800f0922) is a high-severity fault affecting the Windows operating system. Windows Update fails to install, typically caused by insufficient space in the System Reserved or EFI System Partition (ESP), Secure Boot configuration conflicts, or active VPN connection blocks. Follow the steps below to fix it.

Before you begin

Save open work and back up important files. Note any recent driver or hardware changes. If Windows cannot start, use the startup guide first.

Work through these checks

0 of 3 complete
01Disconnect from any active VPN client or proxy server and try running the update again.

Disconnect from any active VPN client or proxy server and try running the update again..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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02Verify Secure Boot is enabled in your BIOS/UEFI settings to allow system update validation.

Verify Secure Boot is enabled in your BIOS/UEFI settings to allow system update validation..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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03Extend or clean up the EFI System Reserved Partition (ESP) to ensure at least 15MB of free space.

Extend or clean up the EFI System Reserved Partition (ESP) to ensure at least 15MB of free space..

Use the instructions for your exact device and operating system. Check the manufacturer’s documentation before changing firmware, hardware, or system settings.

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Possible causes

  • The EFI System Partition (ESP) has run out of allocated space for boot configuration files.
  • Secure Boot is disabled or configured incorrectly in the UEFI motherboard settings.
  • An active VPN connection or proxy is blocking communication with Microsoft Update servers.