Updated Samsung galaxy A5 to Marshmallow but look and feel remains that of Lollipop I have a Samsung galaxy A5 (SM-A500H) I didn't get a notification for an update from settings so I grabbed android 6.0.1 from Sammobile, I downloaded the South African version since there's no version for my country.

Everything is working and if I go to settings about phone, I see it's 6.0.1 and if I tap I get the marshmallow logo and the game that looks like flappy bird. And everything is working.

But it still feels like Lollipop. The color is still blue rather than black, the marshmallow themes and wallpapers are missing. When the phone boots I don't see the marshmallow animation, the scrolling in the app drawer is horizontal not vertical etc. 

Is there a way to verify that what I'm using is really marshmallow? Could it be a knockoff?
Lower-end phones usually won't get the new manufacturer skin (that's on the new flagship phone) with a new Android version.

As for the launcher, bootanimation and stuff, it's how Samsung chose to make it in their TouchWiz skin - they don't necessarily follow how Google do it on Nexus.

Try installing Google Now Launcher if you want the vertical scrolling experience. Not looking as harmonious on top of all the TouchWiz icons but better than nothing.