2026-04 Security Update (KB5083769) (26200.8246) - Install error - 0x800736b3

Open Command Prompt (Admin) and run:

sfc /scannow

then:

DISM /Online /Cleanup-Image /RestoreHealth

For a Surface Pro 9 with 5G (SQ3) that is already on build 26200.8037 and fails to install the 2026‑04 security update KB5083769 with error 0x800736b3, the supported remediation path in similar Windows update failure scenarios is an in‑place upgrade/repair using a Windows 11 ISO, while keeping files and apps.

Follow an in‑place upgrade approach similar to the documented procedure for resolving repeated update failures:

1. Download the Windows 11 ISO
   • Go to the official Windows 11 download page.
   • Under “Download Windows 11 Disk Image (ISO)”, select “Windows 11 (multi-edition ISO for x64-apparatus)” (ARM devices use the same multi‑edition ISO distribution channel as documented).
   • Choose the language and download the 64‑bit ISO file.
2. Start the in‑place upgrade from within Windows
   • In File Explorer, double‑click the downloaded ISO to mount it.
   • In the mounted drive, double‑click Setup.exe.
   • On the “Install Windows 11” screen, clear “I want to help make the installation of Windows better”.
   • Select “Change how Setup downloads updates” → choose “Not right now” → Next.
   • Accept the license terms.
3. Choose what to keep
   • On the “Ready to install” screen, select “Change what to keep”.
   • Select “Keep personal files and apps” so that data, apps, and settings are preserved.
   • Confirm and select “Install”. The device will restart several times.
4. Verify and re-run Windows Update
   • After setup completes and the desktop appears, open Settings → Windows Update.
   • Check for updates and confirm that the security update chain now installs successfully.

This in‑place upgrade/repair approach is the documented resolution for persistent Windows update errors (including cases where a prior cumulative update is partially installed or corrupted) and is appropriate for a Surface Pro 9 with 5G already on a recent 26200 build.

References:

• Surface Pro 9 update history
• Latest Security Update KB5079473 (26200.8037) Fails to Install - Microsoft Q&A
• "Windows Update" Updates failed - Microsoft Q&A
• Contacting Microsoft Support With an Update Related Question (KB5071959) - Microsoft Q&A
• Mijn windows updates gaan mis - Microsoft Q&A
• Microsoft Store not working – unable to download or update any apps - Microsoft Q&A

Hi Jim,

Windows 11 has a new built-in feature that usually fixes this kind of error the easy way:

open Settings and go to Windows Update,

select Advanced Options

select Recovery

select Reinstall Now, this will trigger Windows Update to download the repair version of 25H2 and fix your problem

Hope this helps,

Open Command Prompt as Admin and copy-paste:

net stop wuauserv

net stop cryptSvc

net stop bits

net stop msiserver

Then rename update cache:

ren C:\Windows\SoftwareDistribution SoftwareDistribution.old

ren C:\Windows\System32\catroot2 catroot2.old

Restart services:

net start wuauserv

net start cryptSvc

net start bits

net start msiserver