My Samsung Galaxy A14 5G is stuck on One UI 5.1

[ChaseBruen]

I have a samsung galaxy a14 5g and I am stuck on the update 5.1. My brother has the same phone as me and got the update with no problem! But i can't, When I go to check for update it says, device is up to date. EVEN THOUGH IT IS NOT! My brother has 6.1 but I am stuck on 5.1. please, PLEASE HELP ME!

[ChaseBruen]

I have a huge problem to you.Smoke switch.I need that cable.I have it but I don't have any small Outlet
for my computer