Windows 10 KB5000802 (March) update is crashing PCs with BSOD

Windows 10 KB5000802 BSOD

Windows 10 KB5000802 (March
2021 update) has been going seriously wrong for some PC
owners in the last twelve hours, with several users reporting
that the botched update is causing Blue Screen of Death errors
when they use printers.

To make matters worse, KB5000802 is an automatic security
update, which means it has been downloaded and installed
automatically for some customers. Users didn’t have a say in
whether or not Microsoft should install the update and break
their computers with BSOD.

March 2021 cumulative update is proving troublesome for PCs
with printers, going by reports on online forums. According to
reports, Windows 10 completely crashes and throws up a Blue
Screen of Death with 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 seems to be causing blue screens when printing to
Kyocera Universal Print drivers. Have had at least 20 confirmed
cases from 4 different clients already and it’s only been an
hour into the day”.

Reports of printer failures include Kyocera, Ricoh, Zebra, and
others.

It’s not clear how many machines were affected by this problem,
but we’ve seen numerous reports of error popping up here and
there.

The most worrying thing is that Windows 10 simply crashes when
users try to print via Notepad, Office and other apps. This
happens only when your device is using an affected
printer/printing driver.

For those on Windows 10 version 1909, a similar issue 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
broke all Kyocera printing for their clients. None of the
workarounds helps except removing the cumulative update.

Windows 10 Win32kfull BSOD

“I have tried on several workstations removing wusa /uninstall
/kb:5000802 solves the problem. Windows 10 2004 and 20H2 seems
to have identical BSODs. I have also tried to update drivers to
the recent KX Universal Printer Driver (v.8.1.1109) but that
does not solve the problem,” a said user.

Some users have also reported that Microsoft has temporarily
halted the rollout of the March 2021 cumulative update, while
others said that they’re still seeing the cumulative update on
the Windows Update page.

How to fix win32kfull.sys BSOD after March 2021 update

The fix for BSOD is simply rolling back to an earlier restore
point on the PC or uninstall the update manually. To uninstall
the update, follow these steps:

  1. Open Settings > Update & Security > Windows Update.
  2. Click on ‘View Update History’
  3. Click on ‘Uninstall updates’ link.
  4. Locate the update and click on ‘Uninstall’.

If you’re unable to uninstall the patch via Control Panel, you
can also use the following Command Prompt or PowerShell command
to remove the patch manually:

wusa /uninstall /kb:[id]

In the above command, you would need to replace the KB ID with
the one that you wish to uninstall.

If you’re on v2004 or 20H2, the command would be wusa
/uninstall /kb:5000802
. For version 1909/1903, the
command is wusa /uninstall /kb:5000808.

Uninstall Windows update

Another workaround involved switching to Microsoft PCL6 printer
drivers or removing the printers completely (including
drivers).

Once you’ve followed the above steps, open the same Settings
app again and pause the updates.

This is a developing story.

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