When discussing , here are key points to consider:

To implement iPA on Facebook for iOS 12.5.5:

Stay safe, protect your account, and avoid sideloading social media apps from unverified sources.

If you cannot find a working IPA or the old app crashes on login, the best solution for iOS 12.5.5 users is to use the web version.

(like the iPhone 5s, 6, or 6 Plus) is no longer possible through the standard App Store "Get" button because the current version requires iOS 13.4 or later Apple Support Community