Insider KB5094980 Windows 11 Insider Experimental (26H1) build 28120.2242 - June 8



 Windows Insider Blog:

  • This update includes a small set of general improvements and fixes that improve the overall experience for Insiders running this build on their PCs.
[Administrator protection]
  • After resuming the rollout of Administrator protection as enabled by IT admins, we are also now rolling out the ability to enable Administrator Protection in Settings under Privacy & security > Windows Security > Account protection and switching the toggle to on. A restart will be required. 



 Source:



Check Windows Updates



UUP Dump:

64-bit ISO download:

ARM64 ISO download:


 
Last edited:
This went from 28020.2207 to 28120.2242 and changed the insider page from Dev to this showing below.
It was a full reinstall and created Windows.old folder with 18.9 GB.

Edition Windows 11 Pro Insider Preview
Version 26H1
Installed on ‎6/‎8/‎2026
Evaluation expires on ‎8/‎11/‎2026 11:09 AM
OS build 28120.2242
Experience Windows Feature Experience Pack 1000.26100.361.0

1780972831324.webp
 
Last edited:

My Computer

System One

  • 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
Before Removing files:

1780973409269.webp

After the cleanup:
1780973693660.webp
 

My Computer

System One

  • 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
There was still one package left and required DISM /ONLINE /CLEANUP-IMAGE /STARTCOMPONENTCLEANUP to get rid of it.

1780974141481.webp
 

My Computer

System One

  • 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
The full reinstall downgraded the Intel graphics driver and I had to update it again.
Old driver after Windows update:
1780974749006.webp


After reinstalling the latest driver, Intel DSA was happy again.
1780975089975.webp
 

My Computer

System One

  • 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
Like on 295xx I had to reinstall .NET 3.5 that is still used by some programs.

1780975760625.webp
 

My Computer

System One

  • 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
With this build they finally fixed the WinRE Error code 0xc0000428 that used to fail to verify the winload.efi signature. Problem started with 2820.1611 and was still failing with 2820.2207 on several machines. This one just updated to 28120.2242 is a Dell XPS 8930, now Shift + Restart works as expected. 🤞

1780977683675.webp
1780977721949.webp
 

My Computer

System One

  • 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
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