During App development we must always operate under the specifications and guidelines provided by Apple and Google, which suggests that, among other things, that apps and app updates for the App Store and Google Play Store must always be developed using the latest iOS and Android versions. This means that new apps are reserved for the current smartphone operating systems and hardware. Because our products are also security related, we advise that you always use the latest smartphone with the most recently updated version of iOS or Android.
You can find the current minimum requirements for the app in the Apple App Store or Google Play Store, depending on your operating system.