Windows 10 KB4549951 is causing critical issues for some users

Windows 10

A handful of Windows 10 users are reporting a wide range of
issues after installing Windows 10 KB4549951 cumulative update,
while others report an error message when they attempt to
download and install important security package, which was
released on Tuesday.

In Microsoft’s forum and Feedback Hub, many users have reported
that Windows 10 installation issues are once again back with
KB4549951 and this apparent bug is preventing people from
keeping their devices up-to-date.

Despite the problems updates have caused users, it is still
important to ensure you have the latest security patches.
Unfortunately, this is another update that fails to install
with generic error messages like 0x8007000d, 0x800f081f,
0x80073701, etc.

It’s not clear why Windows 10 updates are still failing to
install for some users and Microsoft has yet to acknowledge or
document the problems.

If you have already followed the traditional workarounds
available on the internet and nothing seems to work to resolve
the issue with Windows Update, you may want to consider
performing a clean installation of Windows 10. To perform a
clean installation, you’ll need to download ISO images and
reinstall Windows 10.

Windows 10 KB4549951 issues

KB4549951 issues include broken Bluetooth, WiFi, connectivity
problems, BSOD, poor system performance, and even complete
system crashes for some users. It is important to note that
only some users are reporting the issue and not everyone is

KB4549951 issues

“I wanted to let you know that after installing this update
“KB4549951″ my device no longer has a Bluetooth adapter
according to Windows (which of course is false, since it still
worked yesterday before installing this damn update,” one user
told us in an email.

“I updated (KB4549951) my Window 10 on 15.04.20. After
updating, Bluetooth stops working. Now Bluetooth is not showing
in Device Manager. I tried to uninstall Updates but still, it
is not showing. What to do now. My Laptop supports Bluetooth,”
another user reported the same issue in Microsoft’s forum.

It looks like there is a compatibility issue between the
Bluetooth driver and Windows 10 update. In this case, you
should roll back to the previous version of Windows and
reinstall the driver if it doesn’t up.

Blue Screen of Death

Unfortunately, Microsoft’s patch also causes dreaded error
‘Blue Screen of Death’ to appear on the screen, which signals a
complete system crash.

One victim wrote that their MSI computer booted with a BSOD
after applying this update.

“I was hit with the infamous blue screen ( YOUR DEVICE RAN INTO
A PROBLEM AND NEEDS TO…..) with each time a different stop
code,” user explained.

“I noticed that after installing the KB4549951 update, I get
BSODs with the error “KERNEL MODE HEAP CORRUPTION” whenever I
try to do something seemingly CPU-heavy (watching
livestreams/conferences, even trying to look at the Event
Viewer). I did some experimenting and noticed that the update
was seemingly the cause of the BSOD – everything else seems to
be fine,” another frustrated documented the bug.

There’s usually nothing you can do to fix BSOD errors, but
users can roll back to an earlier version of Windows if their
devices allow them to, or they can reinstall Windows 10.

It’s worth noting that these issues are being widely reported,
but it only affects a group of users and not everyone is

For some users, Windows 10 appears to be throttling WiFi speed
and causing other internet issues.

“After this update, my pc cannot connect to the internet. I can
see the wifi adapter in the device manager and there are no
problems reported. No available networks show to connect too,”
one customer highlighted another issue with this patch.

“The Windows update I got on Tuesday 14 April 2020 caused my
wi-fi upload speed to drop from 200+ Mbs per second to between
.5 and 6 Mbps,” another user noted.

Microsoft says it isn’t aware of any issues despite several
online complaints on its own forums and Feedback Hub. If you
already downloaded the patch and it broke something for you,
your best bet is to revert to a more stable version of Windows

To do this, follow these steps:

  • Go to Settings.
  • Click “Update and Security” and choose “Windows Update”.
  • From there, open “View update history”.
  • Click “Uninstall updates.”
  • Find the particular KB package in Control and uninstall it.
  • Reboot your device. (Reset your PC if you’re still
    experiencing issues).

If you do notice any issues with April 2020 cumulative update,
feel free to let us know in the comments.

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