BSOD STOP error 21a

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After installing this update I get the BSOD with STOP error 21a.

I managed to go back to a system restore point, probably made by the installer of the update.

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Your post is in the v21H1 Forum.
V21H1 has not been released yet. (It is only an Insider version now)
Please type winver in the taskbar search box and hit Enter.
What version and Build number does it report? (Build nnnnn.xxx)

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Yes this BSOD can happen after an update. If you have any connected external devices unplug them to see if the computer will finish properly booting into Windows.

Article for fixing if you get this stop code again, another one with a bit more explanation.

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It happens to me too in version 20H2

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PKCano wrote:

Your post is in the v21H1 Forum.
V21H1 has not been released yet. (It is only an Insider version now)
Please type winver in the taskbar search box and hit Enter.
What version and Build number does it report? (Build nnnnn.xxx)

I use 21H1 build 19043.928.

 

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I’d try first by unplugging all external devices and see if it continues.  Do you have any third party security software installed?

Susan Bradley Patch Lady/Prudent patcher

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Agreed with the unplugging all un-needed devices, especially storage drives. I had no problem updating to 21H1. Did it twice.

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I always update/upgrade with all my USB devices connected (HDDs, Printer, loudspeakers, …) with 0 update/upgrade problems. The only “thing” I disable is Kaspersky A/V software as it slows down the process considerably.

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On my Dell PC with 20H2, I have Malwarebytes and Windows Defender.  For updating, In Malwarebytes, I can turn off web protection, malware protection, exploit protection, and ransom protection.  Any suggestions on disabling?  Is the computer then vulnerable during the update process?  Thanks in advance.

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Microsoft has fixed the critical bugs in Windows 10 version 21H1 (windowslatest.com)

Are you still having that bsod issue?  As it was supposed to be fixed.

Susan Bradley Patch Lady/Prudent patcher

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Susan Bradley wrote:

Microsoft has fixed the critical bugs in Windows 10 version 21H1 (windowslatest.com)

Are you still having that bsod issue?  As it was supposed to be fixed.

I had different stop errors: 21a.

After executing “bcdedit.exe /set nointegritychecks on” I had no more 21a Stop errors.

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