How to install iOS 15.2 on iPhone 8
How do I install iOS 15.2 to my iPhone 8
Trying to download American Express app but needs the upgrade to iOS 15.2
[Edited by Moderator]
How do I install iOS 15.2 to my iPhone 8
Trying to download American Express app but needs the upgrade to iOS 15.2
[Edited by Moderator]
The App Store Preview page says that the Amex app "Requires iOS 15.2 or later." If you're running something later, you probably would not need to downgrade – even if you could.
If you're running something earlier than iOS 15.2, upgrade to the latest version of iOS 16. Then download the app.
Update your iPhone or iPad - Apple Support
The latest version of iOS available for the iPhone 8 as I write is iOS 16.7.2.
You cannot install an older version of iOS such as iOS 15.2.
How to install iOS 15.2 on iPhone 8