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  • BSOD STOP error 21a

    Viewing 8 reply threads
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      • #2364639
        anonymous
        Guest

        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.

      • #2364693
        PKCano
        Manager

        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)

      • #2364798
        anonymous
        Guest

        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.

      • #2365111
        anonymous
        Guest

        It happens to me too in version 20H2

      • #2365466
        anonymous
        Guest

        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.

         

      • #2365552
        Susan Bradley
        Manager

        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

      • #2366181
        krism
        AskWoody Plus

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

        Group W (windows, current)
        - ThinkPad T570-20HA, i7-7600U, 2.8GHz, UEFI/GPT, Win10 21H1 Pro x64, 16GB, Sammy 256GB M.2 NVMe PM961. -

        • #2366198
          Alex5723
          AskWoody Plus

          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.

          • #2366421
            Jasmo1046
            AskWoody Plus

            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.

      • #2366508
        Susan Bradley
        Manager

        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

      • #2367233
        anonymous
        Guest

        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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