Windows 10: SSU KB4601390 pulled, revised SSU KB5001079 released

[German]Microsoft had pulled a second Servicing Stack Update (SSU) KB4601390 for Windows 10 due to serious issues. In the meantime, they have replaced the SSU from February 9, 2021 with the new Servicing Stack Update KB5001079. Here is some information, how to re-enable further update installs on affected Windows 10 clients and Windows Servers.


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SSU KB4601390 for Windows 10

Servicing Stack Update KB4601390 had been shipped since February 9, 2021 (Patchday), for Windows 10 version 1507 (RTM) and more builds. After installing this SSU, machines running Windows 10/Server 2016, users experienced hangs at 24% of the progress bar when installing the further security updates. According to this status page, the following Windows 10 versions were affected:

  • Client: Windows 10 Enterprise LTSC 2016; Windows 10, version 1607; Windows 10 Enterprise 2015 LTSB
  • Server: Windows Server 2016

The installation then did not comes to a successful end, i.e. security updates could no longer be installed. The remedy was to reboot the system and perform the following steps in an administrative prompt (see).

net stop bits
net stop wuauserv
Ren %systemroot%\SoftwareDistribution\DataStore *.bak
Ren %systemroot%\SoftwareDistribution\Download *.bak
Ren %systemroot%\system32\catroot2 *.bak

The steps reset the Windows Update component store with the update packages. Afterwards, the Windows machine has to be restarted again. Then the new SSU package KB5001079 (Servicing stack update for Windows 10: February 12, 2021) should be installed automatically via Windows Update. This SSU corrects the error of the old update KB4601390. Afterwards, the security updates from February 2020 should also be able to be installed on the affected machines again.

Windows 10/Server 1607 affected by SSU KB4601392

This is the second servicing stack update Microsoft has pulled this month. SSU KB4601392 for Windows 10 version 1607 clients and for Windows Server 1607 systems also had the problem of subsequent update installations getting stuck at 24% progress. There Microsoft then released the revised Servicing Stack update KB5001078 as a solution. I had reported about it in the blog post Fix for Windows 10/Server 1607 update hang at 24% due to SSU KB4601392.  (via)


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Similar articles:
Microsoft Office Patchday (February 2, 2021)
Microsoft Security Update Summary (February 9, 2021)
Patchday: Windows 10-Updates (February 9, 2021)
Patchday: Updates for Windows 7/Server 2008 R2 (February 9, 2021)
Patchday: Windows 8.1/Server 2012 Updates (February 9, 2021)
Patchday Microsoft Office Updates (February 9, 2021)
Windows 10 V1909 Out-of-Band Update KB5001028

Fix for Windows 10/Server 1607 update hang at 24% due to SSU KB4601392


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