Windows 10: Upgrade Windows 10 from Build 1909 to 20H2 keeps failing with message: Error code...

I tried multiple times to upgrade Windows 10 from Build 1909 to 20H2but it keeps failing with folllowing message:

Error code 0xC1900101 – 0x20003

The installation failed in the SAFEOS phase with an error during the INSTALL_UPDATES operation

Windows 10 20H2 Setup was run from downloaded ISO FileMounted

All Windows Updates are installed, c:\windows\SoftwareDistribution cleaned/deleted, WU Troubleshooter says ok.

Windows Store ist clean an d up to date.

Windows 10 Build 1909 runs withoutproblems, Eventlog is clean no errors.

Device Drivers and BIOS are up to date Dell UpdateUtility, drivers show no exclamation mark.

Free Disk Space > 60GB.


Chkdsk c: says no errors.

sfc /scannow

Dism /Online /Cleanup-Image /CheckHealth

Dism /Online /Cleanup-Image /ScanHealth

Dism /Online /Cleanup-Image /RestoreHealth

Rundll32.exe pnpclean.dll,RunDLL_PnpClean/DRIVERS /MAXCLEAN


I have upload the SetupDiag log file ifsomeone can have a look.

https://1drv.ms/u/s!AlblyZc--RhFgpQ8c3RE_jNlkroGiQ?e=2gASS0


I appreciate any ideas which help me to solve this problem.

:)

 

cannot update 20H2 build 19042.662 for last 2 months

There are multiple steps that can be performed to troubleshoot failed upgrades.
An in place upgrade repair if it fails should generate an error message and code that is useful to start the troubleshooting.
So for a failure start an new thread with the error message and code and logs can be collected.
List: antivirus, firewall, drive encryption software

 

Upgrade from 1909 to 20H2

When upgrading you can install 1607 and upgrade to 20H2.
So upgrade from 1909 to 20H2 with the upgrade assistant.

If there is success then that will complete the thread.
If the upgrade fails then record the error message and code for troubleshooting.

 

Upgrade to 20H2 failed

The laptop was offered the feature upgrade to Win 10 20H2. It is still running 1903. It had failed 1909, 2004 with this error 0x80004005 - 0x1000A,The installation failed in the DOWNLEVEL phase with an error during PREPARE_FIRST_BOOT operation.

Since Microsoft does not like this laptop anymore I had done a chkdsk, a SFC / scannow and a disk error check from the properties tab. All errors fixed.

I stopped MS secutity, firewall and the Avast security for the upgrade.

Downloading and installing took some time and it looked as if the laptop was going through the motions. At the end it had just reverted to 1903 again.

What else can I do short of a complete reset?