[DISCUSSION] Windows 11 26H1 Insider Preview Build 28020 (PC) [Canary - br_release]

Discussion in 'Windows 11' started by Enthousiast, Jan 16, 2026.

  1. Paul Mercer

    Paul Mercer MDL Guru

    Apr 6, 2018
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    it's a known issue now

     
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  2. Enthousiast

    Enthousiast MDL Tester

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    That's the same as putting a sign: "bad road ahead", so it doesn't need to be fixed ;):D
     
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  3. Enthousiast

    Enthousiast MDL Tester

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    #23 Enthousiast, Feb 4, 2026
    Last edited: Feb 4, 2026
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  4. rulman

    rulman MDL Member

    Jan 25, 2012
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    @Enthousiast
    Hello, how can I install .NetFx3 on this version?



    Code:
    The program gives an installation error on Windows 11 26H1. Windows 11 26H1 has ended support for .NetFX3.
    
    ***
    
    When installing with Dism or PowerShell:
    
    Error: 0x800f080c
    
    Feature name NetFX3 is unknown.
    
    Error: 0x800f080c
    
    Feature name NetFX3 is unknown.
     
  5. Paul Mercer

    Paul Mercer MDL Guru

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  6. rulman

    rulman MDL Member

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  7. Paul Mercer

    Paul Mercer MDL Guru

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    well, the very old drivers on my ancient laptop are working fine with that standalone nfx installer, so I can confirm it works on my end
    I suppose your software is checking the nfx3 state in an unexpected place (should be the windows registry, right?), can't see an obvious way to fix it
     
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  8. Paul Mercer

    Paul Mercer MDL Guru

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  9. Enthousiast

    Enthousiast MDL Tester

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  10. steven4554

    steven4554 MDL Expert

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    #30 steven4554, Feb 12, 2026
    Last edited: Feb 12, 2026
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  11. Enthousiast

    Enthousiast MDL Tester

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    #31 Enthousiast, Feb 13, 2026
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  12. Enthousiast

    Enthousiast MDL Tester

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  13. Carlos Detweiller

    Carlos Detweiller Emperor of Ice-Cream
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    Desktop Watermark does show correct build now.

    correct_build.png
     
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  14. steven4554

    steven4554 MDL Expert

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    @Enthousiast I also encountered this error when it 100% after restarting, so it reverted back to 1546 build. So later today I'm going to build a homebrew iso created using uupdump and upgrade that way. Should work, now bed time as my eyes need some rest. :)
     
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  15. Enthousiast

    Enthousiast MDL Tester

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    #35 Enthousiast, Feb 13, 2026
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  16. steven4554

    steven4554 MDL Expert

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    That's not good as I have a lot of stuff in my personal folders, still going to try the upgrade if not then start from scratch again.

    Thanks MS for screwing up your builds and forcing people to clean install.
     
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  17. Enthousiast

    Enthousiast MDL Tester

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    @steven4554 please let me know if it did work for you or not :)
     
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  18. steven4554

    steven4554 MDL Expert

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    #38 steven4554, Feb 13, 2026
    Last edited: Feb 13, 2026
    Will do, I just started making the conversation process of build 1611.

    I have launched setup and everything is available to me with the installer.
    (Backup my stuff just in case, but nothing was removed after the upgrade.)
    Screenshot 2026-02-13 162133.png

    I will point out that I made a registry change before launching setup, to get this to work and setup will restart after launching the exe. I have attached this as well.

    The reg changes the build number to 28000.1546.amd64fre.br_release_flt.260124-0306.

    Update - The build installed with no problems and the build info in bottom right is now correct.
     

    Attached Files:

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  19. Carlos Detweiller

    Carlos Detweiller Emperor of Ice-Cream
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    #39 Carlos Detweiller, Feb 13, 2026
    Last edited: Feb 14, 2026
    I had 28020.1371 IIRC (upgraded by ISO). Then, updated to 28020.1611 by W10UI. Worked OK.

    I guess with Server I'll have to go clean...
     
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  20. Enthousiast

    Enthousiast MDL Tester

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    May i ask what triggered you to change the buildlabex to a not really existing build? Did it offer to keep all before the change? And did WU fail for you too?

    I am testing a fresh 28020.1546 install (without MRP) and running WU, to see what happens and what update method it uses, hotfix or full uup file upgrade like it did with my original canary channel install.

    Testing that too, might not be tonight but it is on my todo list :D

    28020.1611 ;)
     
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