Apart from the new iOS 14.3 software update, Apple also released iOS 12.5 for older iPhone models that don't support iOS 14. Why are they still doing that for out of date devices? Well, turns out that the iOS 12.5 includes COVID-19 exposure notification support. 

Apple has released the new and improved iOS 12 which brings several improvements such as performance as well as stability to new as well as older iOS devices starting from the iPhone 5s and iPad mini 2 onwards. Based on the changelogs, the new iOS 12 is expected be able to open up apps up to 70% faster while text input is up by up to 50%.