What better pastime on a weekend than trying to upgrade a laptop with Windows 10 1809 installed on it that refuses to let itself get upgraded or install any Windows updates for that matter? I really cannot think of anything ...
But lets start from the top: This laptop has Windows 10 1809 Education installed on it. With an UBR value of 253, which puts its update status on January 8th 2019 ... more than 2 years since the last Windows update was installed.
Every attempt to install a newer Windows 10 version would always fail with the error 0x8007001F - 0x20006, accompanied with the error message "The installation failed in the SAFE_OS phase with an error during REPLICATE_OC operation." (in German: "Die Installation war nicht erfolgreich. In der Phase SAFE_OS ist während des Vorgangs REPLICATE_OC ein Fehler aufgetreten.")
And every attempt to install any regular Windows updates would throw an "This Update is not Applicable to your Computer." error (in German: "Das Update ist nicht für Ihren Computer geeignet.")
But this is just where it all starts ...