Great nick MixTech has published on YouTube a short video which shows the version of the firmware with a fresh Marshmallow on 6.0.1 Android smartphone Samsung Galaxy S5. According to the author, updating it “over the air”, probably here used the same method of obtaining access to the beta test for the Galaxy S6 and Galaxy S6 edge.
Note that at the moment, the Galaxy S6 and Galaxy S6 edge are the only two models for which Samsung officially launched the beta program for Android 6.0 Marshmallow. According to experts, most likely, this Galaxy S5 (SM-G900F) received the beta version of Android 6.0.1 just for errors. Although we cannot exclude the possibility that its just ported.