I found an easier way, that worked for me:
1. Install Samsung Update via Microsoft Store, choose your model & OS and download the software 2. Install the downloaded Samsung Setting software 3. Reboot
I need the FN-keys mainly for the fan, which had become very loud. Now it is much better with silent mode (FN+F11-key on my NP 900X3C). RAM-Upgrade unfortunately is not possibile due to firmly soldered RAM...
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