Re: Galaxy S6 runs Marshmallow
Same with my Nexus 7. On my Photon Q I had to install Cyanogenmod. So far the only device I have that can't run Android M is the original LG G1, which truly has done its time and can serve only as a museum-piece now.
Actually, now that I think about it my Samsung Galaxy Note Pro 12.1 (top of the line, expensive tablet) is still stuck on Android 5 with little sign of movement. Now that *is* frustrating. Could CM it, but in this case the Samsung supplied apps (to support the inbuilt Wacom digitizer) are essential.