Insider KB5124197 Windows 11 Insider Beta (25H2) build 26220.9587 - Oct. 2



 Microsoft Support:

Changes and improvements​

[Unicode]​

  • We've updated Windows text shaping support for Unicode 17.0, helping Windows correctly display and shape newly encoded characters and scripts. Unicode 17.0 added 4,803 characters, including support for four newly encoded scripts: Beria Erfe, Sidetic, Tai Yo, and Tolong Siki.
  • These updates help keep Windows text support current as the Unicode Standard evolves and improve support for languages and writing systems used by people around the world.

[Settings]​

  • We're making performance improvements to the Settings home page, which should result in reduced loading times in certain scenarios.

[Recovery]​

  • We're adding a new entry point for Cloud Rebuild under Settings > System > Recovery, making it easier to access the feature from Settings.

    www.elevenforum.com

    Cloud Rebuild Windows 11

    This tutorial will show you how to use Cloud rebuild to perform a full clean reinstall of Windows 11 from Windows Recovery (WinRE). Starting with Windows 11 build 26300.8772 (Experimental 26H2), build 26220.9343 (Beta 25H2), and build 28120.3032 (Experimental 26H1) for Insiders, Microsoft is...
    www.elevenforum.com www.elevenforum.com

Reminders for Windows Insiders in the Beta Channel​

  • Updates are based on Windows 11, version 25H2 via an enablement package (Build 26220.9587).
  • The desktop watermark shown at the lower right corner of the desktop is normal for Windows Insider pre-release builds.
  • Features and experiences included in these builds might never get released as we try out different concepts and get feedback. Features might change over time, be removed, or replaced and never get released beyond Windows Insiders. Some of these features and experiences could show up in future Windows releases when they're ready.
  • Some features in active development we preview with Windows Insiders might not be fully localized, and localization will happen over time as features are finalized. As you see issues with localization in your language, report those issues to us via Feedback Hub.
  • Check out Flight Hub for a complete look at what build is in which Insider channel.


 Source:

learn.microsoft.com

Windows 11 Insider Beta Preview Build 26220.9587 - Windows Insider Program

Release notes for Windows 11 Insider Beta Preview Build 26220.9587
learn.microsoft.com
blogs.windows.com

Announcing new builds for 2 October 2026

Hello Windows Insiders, Today, we’re releasing new Windows 11 Insider Preview builds to the Beta and Experimental channels. New builds this week Select your channel below to view its release notes: Beta:
blogs.windows.com blogs.windows.com


Check Windows Updates


UUP Dump:

64-bit ISO download:
uupdump.net

Select language for Windows 11 Insider Preview Feature Update (26220.9587) amd64

Select language for Windows 11 Insider Preview Feature Update (26220.9587) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net

ARM64 ISO download:
uupdump.net

Select language for Windows 11 Insider Preview Feature Update (26220.9587) arm64

Select language for Windows 11 Insider Preview Feature Update (26220.9587) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.
uupdump.net

www.elevenforum.com

UUP Dump - Download Windows Insider ISO

UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...
www.elevenforum.com www.elevenforum.com
 
Last edited:
Click to expand...
1790961455182.webp
 

My Computer My Computer

At a glance

W11 Pro and Insider DevAMD Ryzen 9 7900x2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30Gigabyte Rx 6600XT Gaming OC 8G Pro
OS
W11 Pro and Insider Dev
Computer type
PC/Desktop
Manufacturer/Model
Home brewed
CPU
AMD Ryzen 9 7900x
Motherboard
ASROCK b650 PRO RS
Memory
2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30
Graphics Card(s)
Gigabyte Rx 6600XT Gaming OC 8G Pro
Sound Card
MB, Realtek Ac1220p
Monitor(s) Displays
3 x 27"
Screen Resolution
1080p
Hard Drives
Kingston KC3000. 1TBSamsung 970 evo Plus 500GB, Crucial P1 NVMe 1TB, Lexar NVMe 2 TB, Silicon Power M.2 SATA 500GB
PSU
Seasonic 750W
Case
Custom Raidmax
Cooling
Arctic Liquid Freezer III 360mm
Internet Speed
20/19 mbps
I was on 26220.9568, I installed the enablement package that took me to 26300.9568. This beta does not show up. I am still in the Windows Insider Beta. Am I on a different flight now - per the image here, I am still on the 26H2 beta. Not sure what I should be doing to continue to get beta builds - uninstall the recent enablement package?




Screenshot 2026-10-02 at 1.31.12 PM.webp
 

My Computer My Computer

At a glance

Windows 11Apple M1 Max 10 core/4 CPU assigned to Parall...64GB/24GB assigned to Parallels 17 VMApple 32 core GPU
OS
Windows 11
Computer type
Laptop
Manufacturer/Model
Apple MacBook Pro 16" 2021
CPU
Apple M1 Max 10 core/4 CPU assigned to Parallels 17 VM
Motherboard
Apple Silicon M1 Max
Memory
64GB/24GB assigned to Parallels 17 VM
Graphics Card(s)
Apple 32 core GPU
Sound Card
Apple
Monitor(s) Displays
16.2" Liquid Retina XDR
Screen Resolution
3456-by-2234 native resolution at 254 psi
Hard Drives
4TB SSD
PSU
Apple
Case
Apple
Cooling
Apple
Keyboard
Apple
Mouse
N/A; Apple Trackpad
Internet Speed
1.2Gb/42Gb
Browser
Parallels 17 VM: MS Edge
Antivirus
Parallels 17 VM: MS Defender
Awalt said:
I was on 26220.9568, I installed the enablement package that took me to 26300.9568. This beta does not show up. I am still in the Windows Insider Beta. Am I on a different flight now - per the image here, I am still on the 26H2 beta. Not sure what I should be doing to continue to get beta builds - uninstall the recent enablement package?




View attachment 185065
Click to expand...
Same happened with last update, You must uninstall 26H2 enablement package to receive updates.
 

My Computer My Computer

At a glance

W11 Pro and Insider DevAMD Ryzen 9 7900x2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30Gigabyte Rx 6600XT Gaming OC 8G Pro
OS
W11 Pro and Insider Dev
Computer type
PC/Desktop
Manufacturer/Model
Home brewed
CPU
AMD Ryzen 9 7900x
Motherboard
ASROCK b650 PRO RS
Memory
2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30
Graphics Card(s)
Gigabyte Rx 6600XT Gaming OC 8G Pro
Sound Card
MB, Realtek Ac1220p
Monitor(s) Displays
3 x 27"
Screen Resolution
1080p
Hard Drives
Kingston KC3000. 1TBSamsung 970 evo Plus 500GB, Crucial P1 NVMe 1TB, Lexar NVMe 2 TB, Silicon Power M.2 SATA 500GB
PSU
Seasonic 750W
Case
Custom Raidmax
Cooling
Arctic Liquid Freezer III 360mm
Internet Speed
20/19 mbps
CountMike said:
Same happened with last update, You must uninstall 26H2 enablement package to receive updates.
Click to expand...
Thanks Mike. One last question: so if I understand these different flights (never had to get into this lol), latest releases appear to be:
26H2 - via the enablement package. No subsequent beta releases beyond that yet
26H1 - 28020.3742
25H2 - 26220.9587, which came out today

So is my real decision (a) if I want to stay on 25H2 beta, uninstall the enablement package or (b) stay on 26H2 and wait for the next 26H2 beta?

Or is this all wrong lol?

Thanks!
 

My Computer My Computer

At a glance

Windows 11Apple M1 Max 10 core/4 CPU assigned to Parall...64GB/24GB assigned to Parallels 17 VMApple 32 core GPU
OS
Windows 11
Computer type
Laptop
Manufacturer/Model
Apple MacBook Pro 16" 2021
CPU
Apple M1 Max 10 core/4 CPU assigned to Parallels 17 VM
Motherboard
Apple Silicon M1 Max
Memory
64GB/24GB assigned to Parallels 17 VM
Graphics Card(s)
Apple 32 core GPU
Sound Card
Apple
Monitor(s) Displays
16.2" Liquid Retina XDR
Screen Resolution
3456-by-2234 native resolution at 254 psi
Hard Drives
4TB SSD
PSU
Apple
Case
Apple
Cooling
Apple
Keyboard
Apple
Mouse
N/A; Apple Trackpad
Internet Speed
1.2Gb/42Gb
Browser
Parallels 17 VM: MS Edge
Antivirus
Parallels 17 VM: MS Defender
Awalt said:
Thanks Mike. One last question: so if I understand these different flights (never had to get into this lol), latest releases appear to be:
26H2 - via the enablement package. No subsequent beta releases beyond that yet
26H1 - 28020.3742
25H2 - 26220.9587, which came out today

So is my real decision (a) if I want to stay on 25H2 beta, uninstall the enablement package or (b) stay on 26H2 and wait for the next 26H2 beta?

Or is this all wrong lol?

Thanks!
Click to expand...
Yrs, 26H2 - via the enablement package. No subsequent beta releases beyond that yet, not for 26H2 Beta at least last 2 updates, if you want to receive them must uninstall it although judging b what's new, no big loss. It looks funny when a Beta has lower build number than release channel nu it is , what it is.
26H1 - 28020.3742, no idea.
So that means need to stay with 25H2 for now but you can activate some changes with Vivo Tool without changing build.
 

My Computer My Computer

At a glance

W11 Pro and Insider DevAMD Ryzen 9 7900x2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30Gigabyte Rx 6600XT Gaming OC 8G Pro
OS
W11 Pro and Insider Dev
Computer type
PC/Desktop
Manufacturer/Model
Home brewed
CPU
AMD Ryzen 9 7900x
Motherboard
ASROCK b650 PRO RS
Memory
2x16GB Kingston 6000MHz, Cl 32 @ 6200MHz Cl30
Graphics Card(s)
Gigabyte Rx 6600XT Gaming OC 8G Pro
Sound Card
MB, Realtek Ac1220p
Monitor(s) Displays
3 x 27"
Screen Resolution
1080p
Hard Drives
Kingston KC3000. 1TBSamsung 970 evo Plus 500GB, Crucial P1 NVMe 1TB, Lexar NVMe 2 TB, Silicon Power M.2 SATA 500GB
PSU
Seasonic 750W
Case
Custom Raidmax
Cooling
Arctic Liquid Freezer III 360mm
Internet Speed
20/19 mbps
Downloading and installing.

1790965272036.webp
1790965850147.webp

Done:

Edition Windows 11 Pro Insider Preview
Version 25H2
Installed on ‎7/‎31/‎2026
Evaluation expires on ‎10/‎31/‎2027 4:43 PM
OS build 26220.9587
Experience Windows Feature Experience Pack 1000.26100.458.0

Edit:
SFC and DISM scans are clean. 👌
 
Last edited:

My Computer My Computer

At a glance

Windows 11 Pro 25H2Intel I9-9900K64GBNVIDIA RTX 2060
OS
Windows 11 Pro 25H2
Computer type
PC/Desktop
Manufacturer/Model
Dell XPS 8930
CPU
Intel I9-9900K
Memory
64GB
Graphics Card(s)
NVIDIA RTX 2060
Sound Card
NVIDIA High Definition Audio
Monitor(s) Displays
4k Samsung
Screen Resolution
3840 x 2160
Hard Drives
512GB NVMe, ADATA SU 800, 2TB HDD
CountMike said:
Same happened with last update, You must uninstall 26H2 enablement package to receive updates.
Click to expand...
CountMike said:
Yrs, 26H2 - via the enablement package. No subsequent beta releases beyond that yet, not for 26H2 Beta at least last 2 updates, if you want to receive them must uninstall it although judging b what's new, no big loss. It looks funny when a Beta has lower build number than release channel nu it is , what it is.
26H1 - 28020.3742, no idea.
So that means need to stay with 25H2 for now but you can activate some changes with Vivo Tool without changing build.
Click to expand...
Yup, that's what I had to do. I restored my 25H2 beta backups to update to beta 26220.9587. Apparently we can't go to 26H2 yet on beta. I don't know why it allowed the 26H2 enablement package if it wasn't compatible yet. Anyhow my two beta machines are back on 25H2.
 

My Computers My Computers

System One System Two

  • At a glance

    Windows 11 26H2Intel Core Ultra 9 275HX (24-Core)64GB DDR5 6400MT/sNVIDIA GeForce RTX 5080 and Intel UHD Graphics
    OS
    Windows 11 26H2
    Computer type
    Laptop
    Manufacturer/Model
    Alienware 18 Area-51
    CPU
    Intel Core Ultra 9 275HX (24-Core)
    Motherboard
    Alienware
    Memory
    64GB DDR5 6400MT/s
    Graphics Card(s)
    NVIDIA GeForce RTX 5080 and Intel UHD Graphics
    Sound Card
    Onboard, Realtek high-performance Audio chips (ALC3329 & ALC1708))
    Monitor(s) Displays
    300HZ 18-inch QHD 500 nit Comfort View+
    Screen Resolution
    2560 x 1600
    Hard Drives
    2TB NVMe M.2 PCIe Gen 5 SSD
    Case
    Magnesium Alloy
    Cooling
    Advanced Cryo-Tech Quad-Fan Cooling system & large vapor chamber
    Keyboard
    Cherry MX ultra low profile mechanical keyboard with per key AlienFX RGB lighting
    Mouse
    Logitech MX Master 4
    Browser
    Vivaldi (main), Firefox, Chrome, Edge
    Antivirus
    MS Defender and Malwarebytes Free

  • At a glance

    Windows 11 26H2Qualcomm Snapdragon X Elite (12 Core) ARM bas...16GB LPDDR5Qualcomm Adreno X1-85
    Operating System
    Windows 11 26H2
    Computer type
    Laptop
    Manufacturer/Model
    Microsoft Surface Laptop 7
    CPU
    Qualcomm Snapdragon X Elite (12 Core) ARM based CPU
    Motherboard
    Microsoft Corp.
    Memory
    16GB LPDDR5
    Graphics card(s)
    Qualcomm Adreno X1-85
    Sound Card
    Omnisonic speakers with Dolby Atmos spatial sound
    Monitor(s) Displays
    120 Hz 13.8-inch 600 nit PixelSense Flow touchscreen
    Screen Resolution
    2304x1536
    Hard Drives
    1TB NVMe Gen 4 SSD
    Case
    Anodized Aluminum
    Cooling
    Traditional active cooling fan system
    Keyboard
    Mechanical QWERTY, backlit when in use
    Mouse
    Logitech MX Master 4 and Surface Arc Mouse
    Browser
    Vivaldi (main), Firefox, Chrome, Edge
    Antivirus
    MS Defender and Malwarebytes Free
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