Microsoft release out-of-band fix for Windows 10 APC_INDEX_MISMATCH error print-related BSOD

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Updated on March 17, 2021

by Surur Davids

updated on March 17, 2021

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Last week Microsoft caused a large number of Windows 10 users to suffer APC_INDEX_MISMATCH error BSOD crashes when they tried to print after applying KB5000802 (OS Builds 19041.867 and 19042.867) for Windows 10, version 20H2.

The issue affected a subset of Type 3 printer drivers and on Saturday Microsoft released a temporary workaround.

Today Microsoft released an out-of-band cumulative update that fixes the APC_INDEX_MISMATCH error BSOD crashes.

KB5001567 (OS Builds 19041.868 and 19042.868) for Windows 10, version 2004 and Windows 10, version 20H2, has only one fix:

Updates an issue that might cause a blue screen when you attempt to print to certain printers using some apps.

It does however have 2 known issues:

Symptom

Workaround

System and user certificates might be lost when updating a device from Windows 10, version 1809 or later to a later version of Windows 10. Devices will only be impacted if they have already installed any Latest cumulative update (LCU) released September 16, 2020 or later and then proceed to update to a later version of Windows 10 from media or an installation source which does not have an LCU released October 13, 2020 or later integrated. This primarily happens when managed devices are updated using outdated bundles or media through an update management tool such as Windows Server Update Services (WSUS) or Microsoft Endpoint Configuration Manager. This might also happen when using outdated physical media or ISO images that do not have the latest updates integrated.

Note Devices using Windows Update for Business or that connect directly to Windows Update are not impacted. Any device connecting to Windows Update should always receive the latest versions of the feature update, including the latest LCU, without any extra steps.

If you have already encountered this issue on your device, you can mitigate it within the uninstall window by going back to your previous version of Windows using the instructions here. The uninstall window might be 10 or 30 days depending on the configuration of your environment and the version you’re updating to. You will then need to update to the later version of Windows 10 after the issue is resolved in your environment. Note Within the uninstall window, you can increase the number of days you have to go back to your previous version of Windows 10 by using the DISM command /Set-OSUninstallWindow. You must make this change before the default uninstall window has lapsed. For more information, see DISM operating system uninstall command-line options.

We are working on a resolution and will provide updated bundles and refreshed media in the coming weeks.

When using the Microsoft Japanese Input Method Editor (IME) to enter Kanji characters in an app that automatically allows the input of Furigana characters, you might not get the correct Furigana characters. You might need to enter the Furigana characters manually.

Note The affected apps are using the ImmGetCompositionString() function.

We are working on a resolution and will provide an update in an upcoming release.

To get the fix go to Settings > Update & Security > Windows Update and in the Optional updates available area, you’ll find the link to download and install the update. You can otherwise download it directly from the Update Catalogue here.

via Neowin