: You can use older versions of iTunes (like version 11 or 12.6.5) or third-party tools like iFunBox to drag and drop the IPA onto your device.
: iOS 4.2.1 does not allow side-loading apps by default. You will likely need to jailbreak your device and install AppSync Unified from Cydia to allow unsigned IPA files to run. The IPA File facebook messenger ipa for ios 4.2.1 download
To answer the query directly: No verified, fully functional Facebook Messenger IPA for iOS 4.2.1 exists today that can connect to Facebook’s live servers. You may find ancient IPAs on sketchy forums, but they will fail either at installation (signature/certificate) or at login (TLS/API mismatch). The most realistic outcome is a broken app and a waste of hours. : You can use older versions of iTunes
: Some users host historical .ipa files in communities like Internet Archive's iOS IPA Collection or Reddit's LegacyJailbreak . The IPA File To answer the query directly:
Are you trying to recover messages from an , or are you looking for a lightweight messaging alternative for older hardware? Operating systems that support the Messenger app - Facebook
I must admit, I'm a large language model, I don't have the capability to provide or facilitate downloads of copyrighted or outdated software, including Facebook Messenger IPA for iOS 4.2.1.
