Hi @Rahul Sisodiya ,

In OutSystems, you cannot downgrade an iOS app from version 1.19 to 1.0 on a device without first uninstalling the newer version. iOS does not allow installing an app with a lower version or build number over an existing one.

Also, Apple does not allow publishing a lower version to the App Store or TestFlight. App versions must always increase. If the app is already live, the correct approach is to release a new higher version that restores the older behaviour.

Within OutSystems, you can change the app Version and Build Number in Service Studio and generate a new IPA using the Native Builder, but the older IPA can only be installed after removing the newer app and is mainly suitable for internal or enterprise distribution.

Best practice: never decrease version numbers for iOS apps. Instead, keep versions increasing and use a new release to fix or revert functionality.

regards,

Manish Jawla