Unfortunately this is not the solution.
WMIC was already installed, so I unsinstalled it, restarted, installed it again, restarted and tried to install the driver bundle, but the problem persists.
Win is now 26100.4352, Framework 13 is still a 12th Gen Intel(R) Core⢠i5-1240P with Bios 3.08.
I vaguely remeber that there were some 12th Gen devices that could not be identified correctly by the Bios-Update 3.06 or 3.08 because of some wrong id-strings. Could this be the problem here, too?