Better stay with lollipop. F*ck samsung and their products and their softwares.
A3(2016) which means one year old, this is the normal life span for Samsung smartphones, so no wonder, thats why Samsung never again.
Maybe they're playing it safe to avoid accidents that may occur with this phone.
I can freshly remember how Samsung restricted the maximum battery capacity of their Note 7 to aroind 80% in order to prevent the accident that we all know about.