Iam using my s21 ultra from 2 years but it is not updating to android 14 or one ui 6 else and my phone is cpid but shopkeeper has told me that updates will come in this but update is not coming since I have been using 

On android 13 so if I flash my device then it's cpid will remain or not iam so worry it's not updating to one ui 6.1 it's still on one ui 5.1 android 13