Cumulative Update for Windows 11 Insider Preview (10.0.26200.5670) (KB5060831) Failed to install - 0x800f0991


J

JTH

Member
Local time
12:14 PM
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1
OS
Windows 11 Pro (64-bit) insider program Version (Build) 23H2 (10.0.22635)
Starting on 6/27/2025 through today 7/11/25 I have tried 32 times to install “Cumulative Update for Windows 11 Insider Preview (10.0.26200.5670) (KB5060831)” Each time it has failed. Referring to the reason as being, error code 0x800f0991. I have spent so many hours on this and am so burnt out over it at this point. Can anyone advise me? Thank you so very much in advance.

Cumulative Update for Windows 11 Insider Preview (10.0.26200.5670) (KB5060831)
Failed to install - 0x800f0991
 
Windows Build/Version
Windows 11 insider version 24H2 OS Build 26200. 5570

My Computer

System One

  • OS
    Windows 11 Pro (64-bit) insider program Version (Build) 23H2 (10.0.22635)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Lenovo P920 Workstation (ThinkStation) - Type 30BD
    CPU
    Two - Intel® Xeon® Gold 6134 CPU @ 3.20GHz
    Motherboard
    Manufacturer LENOVO Model 1038 BIOS Version S05KT67A
    Memory
    256 GB
    Graphics Card(s)
    NVIDIA GeForce RTX 2080 SUPER
    Sound Card
    Realtek High Definition Driver Version 6.0.9247.1
    Monitor(s) Displays
    Dell P2314H (DP)
    Screen Resolution
    1920x1080
    Hard Drives
    20 TB different Hard drives
    Keyboard
    Logitech (x64) Logitech USB Input Device 1.10.80.0
    Mouse
    HID-compliant mouse Microsoft Driver version 10.0.22621.1
    Internet Speed
    DOWNLOAD 505.8 mbps UPLOAD 582.5mbps
    Browser
    Many, I like Microsoft Edge Version 119.0.2151.44 (Official build) stable app, beta channel (64-bit)
    Antivirus
    Online Protection Firewall Windows Activation
I had a nearly identical issue with my ASUS Vivobook laptop trying to install the same CU. I cleared the Windows Update (WU) cache and stopped and restarted the Windows Update service. In my case the issue was also partially at MS end with their WU servers.

You may want to consider reading these tutorials which have some good information.

www.elevenforum.com

Reset Windows Update in Windows 11

This tutorial will show you how to completely reset Windows Update components and policies to default in Windows 10 and Windows 11. Windows Update keeps Windows 11 updated by automatically downloading and installing the latest updates, drivers, and hotfixes released by Microsoft. Sometimes you...
www.elevenforum.com www.elevenforum.com

windowsreport.com

Clear & Delete Windows Update Cache/ History: 5 Ways

If you want to learn how to clear the Windows Update cache, simply hop on this article to find the best ways without going through hassle.
windowsreport.com windowsreport.com
 

My Computers

System One System Two

  • OS
    Windows 11 Pro 24H2 Beta Insider Channel
    Computer type
    PC/Desktop
    Manufacturer/Model
    Homebuilt
    CPU
    Intel Core i9 13900K
    Motherboard
    Asus ProArt Z790 Creator WiFi - Bios 2703
    Memory
    Corsair Dominator Platinum 64gb 5600MT/s DDR5 Dual Channel
    Graphics Card(s)
    Sapphire NITRO+ AMD Radeon RX 7900 XTX Vapor-X 24GB
    Sound Card
    External DAC - Headphone Amplifier: Cambridge Audio DACMagic200M
    Monitor(s) Displays
    Panasonic MX950 Mini LED 55" TV 120hz
    Screen Resolution
    3840 x 2160 120hz
    Hard Drives
    Samsung 980 Pro 2TB (OS)
    Samsung 980 Pro 1TB (Files)
    Lexar NZ790 4TB
    LaCie d2 Professional 6TB external - USB 3.1
    Seagate One Touch 18TB external HD - USB 3.0
    PSU
    Corsair RM1200x Shift
    Case
    Corsair RGB Smart Case 5000x (white)
    Cooling
    Corsair iCue H150i Elite Capellix XT
    Keyboard
    Logitech K860
    Mouse
    Logitech MX Master 3S
    Internet Speed
    Fibre 900/500 Mbps
    Browser
    Microsoft Edge Chromium
    Antivirus
    Bitdefender Total Security
    Other Info
    AMD Radeon Software & Drivers 25.5.1
    AOMEI Backupper Pro
    Dashlane password manager
    Logitech Brio 4K Webcam
    Orico 10-port powered USB 3.0 hub
  • Operating System
    Windows 11 Pro 24H2
    Computer type
    Laptop
    Manufacturer/Model
    Asus Vivobook X1605VA
    CPU
    Intel® Core™ i9-13900H
    Motherboard
    Asus X1605VA bios 309
    Memory
    32GB DDR4-3200 Dual channel
    Graphics card(s)
    *Intel Iris Xᵉ Graphics G7
    Sound Card
    Realtek | Intel SST Bluetooth & USB
    Monitor(s) Displays
    16.0-inch, WUXGA 16:10 aspect ratio, IPS-level Panel
    Screen Resolution
    1920 x 1200 60hz
    Hard Drives
    512GB M.2 NVMe™ PCIe® 3.0 SSD
    Mouse
    Logitech MX Ergo Trackball
    Antivirus
    Bitdefender Total Security
    Other Info
    720p Webcam
    WiFi & USB to ethernet
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