Windows 10 KB5000802 (March 2021 update) has been going seriously wrong for some PC owners in the last twelve hours, with many users reporting that the Botched Update is causing Blue Screen of Death errors when using the printer.
To make matters worse, KB5000802 is an automatic security update, which means that it is automatically downloaded and installed for some customers. Users do not say that Microsoft should install the update or break their computers with BSOD.
The March 2021 cumulative update is proving troublesome for PCs with printers, going by reports on online forums. According to reports, Windows 10 crashes completely and becomes blue screen of death with the stop error code “APC_INDEX_MISMATCH for win32kfull.sys“.
The problem was first confirmed by one of our readers, who told us that the update is causing BSOD when using printers in their organization:
“This update causes the blue screen when printing Kyocera Universal Print drivers. There are already at least 20 confirmed cases from 4 different customers and this is only one hour a day. “
Reports of printer failures include Kyocera, Ricoh, Zebra, and others.
It is unclear how many machines were affected by this problem, but we have seen many reports of the error popping up here and there.
The most worrying thing is that Windows 10 simply crashes when users try to print via Notepad, Office, LibreOffice and other apps. This only happens when your device is using the affected printer / printing driver.
For those on the Windows 10 version 1909, a similar problem is experienced after Windows 10 KB5000808.
Windows 10 KB5000802 causes win32kfull.sys BSOD
On Reddit, several IT admins have also confirmed that Windows 10 KB5000802 has broken all Kyosera printing for its customers. None of the workarounds help remove the cumulative update.
“I have tried on several workstations that are removing wusa / uninstall / kb: 5000802 fixes the problem. Windows 10 2004 and 20H2 have the same BSOD. I have recently tried to update the drivers with the KX Universal Printer Driver (v.8.1.1109), but that does not solve the problem, ”said one user.
Some users have also reported that Microsoft has temporarily halted the rollout of the March 2021 cumulative update, while others said they are still seeing the cumulative update on the Windows Update page.
How to fix win32kfull.sys BSOD after March 2021 update
To fix “win32kfull.sys” with the stop code “APC_INDEX_MISMATCH”, you need to roll back to a former restore point on the PC or manually uninstall the update. To uninstall the update, follow these steps:
- Open Settings> Updates and Security> Windows Update.
- Click on ‘View update history’
- Click on the ‘Update Uninstall’ link.
- Locate the update and click ‘uninstall’.
- Select ‘Yes’.
The KB package number of the update depends on the version of Windows 10. If you are unable to locate it, the affected updates are KB5000802, KB5000808, KB5000809 and KB5000822, which were cumulative updates for Windows 10HH, version 2004 and older.
How to uninstall windows 10 KB5000802 using command prompt
If you are unable to uninstall the patch through the control panel, you can also use the following command prompt or PowerShell command to remove the patch:
wusa / uninstall / kb: [id]
In the above command, you have to replace the KB ID from the place you want to uninstall.
If you are on v2004 or 20H2, the command will be wusa / uninstall / kb: 5000802. For version 1909/1903, the command is wusa / uninstall / kb: 5000808.
Another solution involves switching to a Microsoft PCL6 printer driver or completely removing the printer (including the driver).
After following the above steps, open Settings> Updates and Security> Advanced Options and stop the update.
Unable to uninstall KB5000802
For some users, the option to uninstall botched updates in the control panel will be missing. Similarly, if you use a command prompt or PowerShell, the process may fail with the following error:
The security update for Microsoft Windows (KB5000802) is required by your computer and cannot be uninstalled.
In this case, you have to roll back to the previous version of Windows using the recovery options. If you do not want to uninstall the update, you can also try the second, third and fourth ways below.
OK crashes when printing APC_INDEX_MISMATCH (win32kfull.sys)
For advanced users, Reddit has a second fix shared by an alleged Microsoft employee and requires Direct Printing.
If you run in APC_INDEX_MISMATCH BSOD after the KB5000802 update, you should enable direct printing, which should allow 32-bit apps to print to 64-bit OS without crashing the OS.
Printing To check the status of ‘Direct Printing’, try these steps:
- Identify your printer name. (Ex: Kyosera tuscalpha) 20 kx).
- Open command prompt (admin / elevated) and run the following command.
rundll32 Printui.dll, PrintUIEntry / Xg / n “Kyocera TASKalfa76 K3”
If you see ‘direct’, it means that direct printing is on and you have the correct settings, and this method won’t help.
If ‘Direct Printing’ is turned off, run the following command:
rundll32 Printui.dll, PrintUIEntry / Xs / n “Kyocera TASKalfa 820 KX” features + direct
In the above example, replace the text “Kyocera TASKalfa 820 KX” with the name of the printer.
If direct printing is already enabled and Windows is still crashing, you can try other advanced fixes associated with Microsoft’s PrintIsolationAware feature:
- Download the Application Compatibility Toolkit from Microsoft’s website.
- After acquiring the toolkit, you can enable “PrinterIsolationAware” by following the guidelines outlined by Microsoft.
A hotfix is now running through Windows Update
On March 15, Microsoft launched a new optional cumulative update for those on Windows 10 version 20 H2, 2004 version and older. Microsoft stated that the patch would address blue screen and printing issues, but it would not install automatically.
The company has published the fix with updates to KB5001567 (v2004 / 20H2), KB5001566 (v1909), KB5001568 (v1809) and KB5001565 (v1803).
To apply the hotfix, you must go to the Windows Update page and click the “Check for updates” button. On a supported device, the update will appear under “Alternative quality updates available” and upon clicking the “Install” button it will start downloading.
- Update 1: Microsoft has accepted BSOD reports in the March 2021 update and more information will be published soon.
- Update 2: In another statement, Microsoft confirmed that the update was affecting only a small subset of printers.
Last update: Microsoft says the bug only affects “a subset of Type 3 printer drivers” and is included in optional updates.
The original update has not been taken and is still being offered through Windows Update. If you use a printer, stop the update or test it before deploying it to your organization, and then apply the hotfix.