Windows 10 just got a fix for the Blue Screen of Death “APC_INDEX_MISMATCH” and “win32kfull.sys” errors. For version 20H2 / 2004, Windows 10 KB5001567 is currently running through Windows Update and it fixes all printer issues that were caused by KB5000802 and other security updates by mistake.
As you may recall, Windows 10 KB5000802, KB5000803, KB5000808 and other cumulative updates released on March 9 proved to be seriously troublesome for devices using certain printer drivers. After the update, users were unable to use printers from popular brands, such as Kyocera, Ricoh and others.
The Windows 10 KB5000802 update also encountered problems for software-based printing, with LibreOffice, Notepad, and even Print to PDF functionality being affected in rare cases.
Fortunately, a reasonable solution for the “APC_INDEX_MISMATCH” bug is now rolling out and it will also patch your printer issues. For version 20H2, the hotfix is in the form of Windows 10 KB5001567, which is currently marked as “optional quality update”.
Also Read: Fix Windows Update error code 0x8024402c
If you check for updates today, you will see the following updates under the section “Alternative quality updates available”:
Cumulative update for Windows 10 version 20H2 for 2021-03 x64-based systems (KB5001567)
Download link for windows 10 KB5001567
Windows 10 KB5001567 Direct Download Link: 64-bit and 32-bit (x86).
“APC_INDEX_MISMATCH” fixes for Windows 10 version 1909, version 1809 and older
For older versions of Windows 10, a new optional hotfix update is also available for your device.
If you are still using version 1903/1909, Microsoft says that your device may have a blue screen “APC_INDEX_MISMATCH” when using the application to print to certain printers.
Here is a list of all the cumulative updates issued to fix “APC_INDEX_MISMATCH” for “32Cfull.sys” error:
- Windows 10 version 20H2 / 2004 – KB5001567
- Windows 10 version 1909/1903 – KB5001566
- Windows 10 Edition 1809 – KB5001568 (Enterprise and Education Edition)
- Windows 10 Edition 1803 – KB5001565 (Enterprise and Education Edition)
How to get the fix now
This fix is currently “optional”, meaning that it will not be automatically downloaded and installed on your computer, at least not yet. If you want the patch now, you can catch the cumulative update by manually downloading it from Windows Update.
To fix the Win32kfull.sys error, Microsoft recommends following these steps:
- Open the settings.
- Click for check for updates.
- Under the ‘Alternate Updates’ section, click on ‘Download and Install’ or you can also see the optional updates in the Settings app.
As you can see in the screenshot above, you can apply the hotfix by clicking the “Download and Install” button. Once done, you will have to reboot the system and your printers will start working again.
A second method of obtaining cumulative updates is by downloading it directly from the Microsoft Update Catalog, where you will find download links for 32-bit and 64-bit Windows 10, respectively.
Windows 10 blue screen cumulative update KB5000802 after March 2021
As we initially reported, the new patches released on March 9 are leading to some users who experience a Blue Screen of Death (BSOD) crash when they click the ‘Print’ option in some apps.
If your device is affected, it will immediately crash with the following error message:
- APC_INDEX_MISMATCH for win32kfull.sys
In a statement, Microsoft stated that the bug is only hitting “subsets of customers”, but users told us that different types of printers are affected. In user reports, we saw bugs hitting printers from Kyocera, Rico and others.
For now, it seems that you can apply out of band ‘optional updates’ to address printing and blue screen bugs.
It is also important to note that Microsoft plans to include these improvements in the April 2021 cumulative update (patch Tuesday), which is currently scheduled to be launched on April 13.