How to update Samsung galaxy s21 ultrau version

[loodin]

I have s21 ultra u version when I click update button it shows your up to date however its andrid 12 ,even now andrid 14 is available for s21 ultra but iam still stuck with andrid 12

any alternative?

[criminaLmodi]

Buy a new phone, simple

[MuhammadIkram071]

It's a carrier phone