You need to look for Facebook Messenger v2.x or v3.x . Versions later than 4.0 generally dropped support for the armv6/armv7 architecture used by iOS 4.2.1 devices.
The primary hurdle is that Facebook’s server-side protocols have changed drastically since iOS 4 was current. facebook messenger ipa for ios 4.2.1 download
While Facebook Messenger may not officially support iOS 4.2.1, alternative methods exist to download and install the app on older devices. Using IPA files from trusted sources and tools like Cydia Impactor or AltStore can provide a workaround. However, users must be aware of the potential security risks and take necessary precautions to protect their devices. As technology continues to advance, embracing newer devices or operating systems might be the most straightforward path to accessing the latest apps and features securely. You need to look for Facebook Messenger v2
Since official support for iOS 4.2.1 ended years ago, the only way to acquire a compatible version is through third-party archives: Internet Archive : Users have preserved historical files such as Messenger-v1910-iOS-4.2.1-crackulous.ipa , which is approximately 3.4 MB. Legacy IPA Collections : Repositories like the ios-ipa-collection legacyiosapparchive While Facebook Messenger may not officially support iOS 4
Installing an IPA on such an old device typically requires specific tools:
: A well-known community repository for legacy apps (requires a Momentum-Dev forum account for downloads). iPhone 3G/iPod Touch 2G App Collection