Two culprits: Security Update from 9/9, (KB5124008)(26200.9445) and (KB5129195)(26200.9457) installed on 9/15

Question

Two culprits: Security Update from 9/9, (KB5124008)(26200.9445) and (KB5129195)(26200.9457) installed on 9/15

Anders Strand-Holm 95

2026-09 Security Update from 9/9, (KB5124008)(26200.9445) and (KB5129195)(26200.9457) installed today, both managed to render File History useless. I have spent hours and days trying to find a useful solution. I was able to uninstall both culprits and prevent them to be installed again.

In the Update History they still appear as successful installed.

However, it leaves two questions open:

#1. When they still appear in the Update history (after Uninstall and Reboot), they could still be installed (?) How to determine if they are still present in my system, despite the uninstall?

#2. If Microsoft could present a fix or workaround, so I could install both Security Updates and still have a fully functional File History, that would be best possible scenario.

Does anybody have a way out of this? - I could fear the upcoming Security Updates will create equally much trouble and time consuming troubleshooting in order to make File History work as designed.

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Answer accepted by question author

SD - IA 180.3K Independent Advisor

Two more issues were fixed with server side rollout today - sadly this was not the day for File History feature, hopefully this week!

Anders Strand-Holm 95 Reputation points

2026-09-17T16:40:35.66+00:00

Thank you for keeping me informed. I hope File History will get a priority soon.

Best, Anders

6 additional answers

Your answer

Anders Strand-Holm 95 Reputation points

2026-09-17T16:40:35.66+00:00

Thank you for keeping me informed. I hope File History will get a priority soon.

Best, Anders

Answer 1

MollFran88 15

Sept 23 - optional update fixed the problem, finally!!

0 comments

Answer 2

SD - IA 180.3K Independent Advisor

Hi,

The issue is Fixed with the Optional update released on 22nd September.

https://yourwindowsguide.com/2026/09/file-history-not-working-after-september-update.html

https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5124010-windows-11-24h2-25h2-update

[File History] This update addresses an issue where File History might fail to back up or restore files to an external drive or network location. Affected devices might incorrectly display a “Reconnect your drive” message even when a compatible backup drive is connected and working properly.

Please click Accept answer to confirm it is solved!

Anders Strand-Holm 95 Reputation points

2026-09-23T05:07:59.7+00:00

Hi DS,

Thanks. Some users report it does not fix the isssue.

Question: Now, should I reinstall (KB5124008)(26200.9445) and (KB5129195)(26200.9457) first?

Best to you DS...Anders
MollFran88 15 Reputation points

2026-09-23T06:01:01.04+00:00

I had all the previous updates installed before today's optional one, and it did fix the problem for me.
Anders Strand-Holm 95 Reputation points

2026-09-23T06:32:09.3866667+00:00

Thanks MollFran88.

I will reinstall both culprits and then today's optional...

Answer 3

SD - IA 180.3K Independent Advisor

Surely, have a great weekend!

0 comments

Answer 4

SD - IA 180.3K Independent Advisor

I will ensure the information is relayed back to you when it is fixed - thanks for the cooperation!

Anders Strand-Holm 95 Reputation points

2026-09-16T17:32:36.95+00:00

Thank you so much. It is most appreciated!
Anders Strand-Holm 95 Reputation points

2026-09-23T12:32:32.32+00:00

Hi SD,

The optional update KB 5124010 fixed the issue. Reinstalled KB5129195 prior to the optional update. FileHistory still works👍

Thank you!

Anderd