Since you cannot download it from the official App Store (Apple will throw error 2807 or suggest updating iOS), you must rely on third-party archives. Here are the top three sources for legacy IPAs:
Yes, but with major caveats. Apple allows downloading older compatible versions of apps with the same Apple ID. Here is the step-by-step legitimate method: facebook messenger ipa for ios 421 download top
: Archive projects often host older IPA files. For example, a Messenger v2.1.1 file known to be compatible with iOS 4.3 exists in community archives. Since you cannot download it from the official
: You must jailbreak your device to install unsigned or modified .ipa files. facebook messenger ipa for ios 421 download top
: Downloading IPA files from third-party sources can pose significant security risks. These files can be modified to include malware or other malicious code.