Windows 11 upgrade failed

I ran into the same “Undoing changes made to your computer” issue — super frustrating. Basically, it means something breaks mid-install (often drivers, antivirus, or corrupted setup files). Here’s what worked for me:

1️⃣ Clean up leftover upgrade files

• Open File Explorer → enable hidden items
• Delete these folders (if they exist):C:\$WINDOWS.~BT C:\$WINDOWS.~WS
• Reboot afterward.

2️⃣ Disable antivirus and cleanup startup stuff

• Temporarily turn off any third-party antivirus or security software.
• In Run → msconfig → Services tab, hide Microsoft services → click Disable all (just for the upgrade).

3️⃣ Run Windows Update Troubleshooter

• Go to Settings → System → Troubleshoot → Other troubleshooters → Windows Update → Run.

4️⃣ Use ISO upgrade (offline method)

• Download Windows 11 ISO from Microsoft.
• Right-click → Mount → run setup.exe.
• When it asks “Download updates,” choose Not right now.
• Follow the wizard — this skips most update-related issues that cause the Windows 11 upgrade failed rollback.

5️⃣ Optional check:
After the failure, check this log for clues:

C:\$WINDOWS.~BT\Sources\Panther\setuperr.log

After doing the above, mine finally went through fine.

Official guide here if you want Microsoft’s steps:
🔗 https://support.microsoft.com/en-us/windows/troubleshoot-problems-updating-windows-188c2b0f-10a7-d72f-65b8-32d177eb136c