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IPA files are essentially the application packages used by iOS to distribute and install apps on devices. They are similar in concept to .apk files on Android. For developers and power users, IPA files offer a way to distribute apps outside of the App Store, either for testing purposes or to install apps on jailbroken devices.
Many modern apps require newer iOS versions, so only old apps (last compatible version) will install. ipa ios 5.1.1