I received One UI 4 before 15 days ago and i don't like it because of it's heating problems. This UI lags even when i using basic apps like phone and what'sapp.
But in One UI 3 my phone was so smooth and no problem at all. So i want one UI 3 back in my phone.
There is no way to rollback, When you update your phone you agree to this condition that your phone can't be rolled back to previous version of OS. You can try resetting your phone once (After taking backup) and see if that helps.
