Can't update Mate 7 to MM

A

AC Question

I bought yesterday Mate 7 and I'd like to update to 6.0 MM. Now I have 4.4.2, but menu and navigation panel is the same as lollipop with triangle, square and circle, and it confuse me
In the section "About phone" is posted that I have 4.4.2
When I try to get update through updater, got message "No updates".
My Mate is MT7-L09, Build number is mt7-l09v100r001c00b145. Please, can someone help me, how can I update M7 to MM 6.0?