A: Only by decompiling the app, replacing APNS certificates (requires developer account) and resigning. Too complex for most.
A community-run "App Store" for legacy iOS devices. Viber .ipa for ios 4.2.1
If you are looking for a Viber .ipa file compatible with iOS 4.2.1, here is the reality of the situation and what you can do to try and make it work. A: Only by decompiling the app, replacing APNS
Navigate to the "Apps" or "Install IPA" section of the software. If you are looking for a Viber
Even if you install the .ipa, Viber’s servers may no longer support the old authentication protocols used by version 2.x.
For iOS 4.2.1, you likely need an older version of iTunes (pre-12.7) that still managed apps.
One of the most requested apps for these older devices is . Unfortunately, modern Viber requires iOS 12 or later, leaving older devices in the cold.