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Windows 10 September Update KB5122878 causes No Operating System found on Acer laptop
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John Price
65
Reputation points
KB5122878 after many reinstallations of Windows 10 ESU consistently crashes a friends Acer laptop. Currently I have left this laptop not enabling ESU updates (KB126256) as I have failed to stop the KB5122878 update installing many times. Am I missing something? Can I stop this one killer update downloading and installing? I have already made the registry edit to stop WindowsUpdate, although I am not confident it works. Any suggestions to save this laptop as safely as possible, currently relying on Malwarebytes.
Windows for home | Windows 10 | Windows update
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Richard Paeschke 0 Reputation points2026-09-26T15:27:45.94+00:00 I have same crash on my MSI computer! It freezes snd must be push stopped on off button. Freezes about a minute after a normal? booting.
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Richard Paeschke 0 Reputation points
2026-09-26T15:28:59.19+00:00 And my computer is not allowing me to remove the update by either Update or command prompt.
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Answer accepted by question author
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(89.60000000000001, 72%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESI%3C/text%3E%3C/svg%3E)
SD - IA
180.3K
Reputation points
Independent Advisor
Answer accepted by question author
SD - IA
180.3K
Reputation points
Independent Advisor
I have now installed the rogue KB5122878 🙂
That is actually the latest update :)
By any chance, are you from the EU? That may explain why enrollment in ESU was not needed.
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John Price 65 Reputation points
2026-09-30T09:34:48.5833333+00:00 I had to enrol in ESU, I'm not in the EU.
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Answer accepted by question author
SD - IA
180.3K
Reputation points
Independent Advisor
I also did research on the issue, and it seems that you are right :( There are some specific models before 2016 which aren't compatiable, sorry :(
6 additional answers
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John Price 65 Reputation points
2026-09-29T16:52:58.15+00:00 I have now installed the rogue KB5122878 🙂
I disabled secure boot in the BIOS, see link.
Safer than leaving it at pre ESU, maybe?
HEY HO!
Thanks for all your help and tips., invaluable to point me in the right direction.
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SD - IA 180.3K Reputation points Independent Advisor
2026-09-28T14:52:29.5533333+00:00 Hi,
I think the Secure Boot thing might be unrelated to this.
Can you see if updating BIOS helps?
https://community.acer.com/en/kb/articles/510-how-to-update-your-bios-on-an-acer-notebook-computer
Follow these instructions please.
Standard 3rd party link disclaimer:
There may be links to non-Microsoft websites that provide accurate and safe information. Watch out for ads on websites frequently classified as PUP (Potentially Unwanted Products). There is no need to buy paid products to fix your computers, as they sometimes do more harm than good.
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John Price 65 Reputation points
2026-09-28T18:04:05.9933333+00:00 Acer as you know have dropped this model, I emailed via their ordering page, begging them to pass on to Support. However I found a BIOS update page on YouTube for my model and downloaded the correct BIOS from Softpedia, what I had found before was rubbish!
I extracted to a USB stick and now my BIOS looks much better.
I will now set ESU off again and cross all appendages
Thank you for your persistence, I'm learning slowly
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John Price 65 Reputation points
2026-09-28T21:27:54.46+00:00 Crashed again I was confident at 100%, then I was back to No Operating System! :(
I also failed to restore with the Windows 10 DVD, I'm restoring back to yesterday's pre ESU enabled clone now. Hopefully you can see the two logs, including the one you requested.
Link Removed as the Security Certificate is the Issue -
John Price 65 Reputation points
2026-09-29T09:22:34.23+00:00 I have now finally got a contact for Acer Support
**The Security Certificate for Secure boot is the issue! THE END if I install Windows ESU
**Update Your Secure Boot Certificates In June 2026 to Stay Protected
By**Blayn-Acer**
Last Updated:Sep 11, 2026
Recommended Article
Secure Boot is a security feature that helps protect your Windows device during startup by allowing it to load only trusted software.
Microsoft Secure Boot certificates that were originally issued in 2011 are approaching expiration starting in June 2026. Updated certificates are being delivered automatically through Windows Update to help keep your device protected.
To ensure your device continues to receive important security updates for the Windows startup process, these updated certificates must be installed before the current ones expire.
From Google AI and Acer Support
Acer devices released before 2021 often lack the motherboard NVRAM space required to store Microsoft's larger, updated Secure Boot certificates (transitioning from the 2011 CA to newer 2016/2023 certs).
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