Even if you successfully install an older version of the Viber application (such as version 2.2.0), it will likely fail to connect. Viber’s modern servers require newer security certificates and API protocols that the legacy infrastructure does not support.
You need Viber version 2.1.2 or earlier . Any version above 2.2 will likely crash on launch or refuse to install due to missing frameworks (like JavaScriptCore or LocalAuthentication ). Viber .ipa for ios 4.2.1
Use legacy tools like or GreenPois0n (designed for iOS 4.2.1). Even if you successfully install an older version