My iPhone X it not allow me to upgrade it

Akinyoya - I see you marked your post as Best Answer. People normally mark a post as Best Answer when it answers the question and no other replies are needed. If you mark a post as Best Answer when you are still looking for an answer, it may slow down any responses to your question. If you are still looking for help, please let us know what happens when you try to update. If there is an error message, let us know what it says.