: You must have "purchased" (downloaded) Facebook on your Apple ID at some point in the past. Step-by-Step : Open the App Store on your iPhone 6 or 5s. Tap your Profile Icon in the top right corner. Go to Purchased (or "My Purchases"). Search for "Facebook" in the list. Tap the Cloud Download icon.

While installing the app is achievable, you should be prepared for performance constraints:

There are three primary methods to install an IPA file on an older iOS device. Depending on whether you have a computer or if your device is jailbroken, choose the method that best fits your setup.

As of April 2026, here is the complete picture of how this "story" currently stands for owners of devices like the iPhone 6 or 5s. The Problem: The "iOS 13.4" Wall

Summary

An is the iOS application archive file that stores an app. Sourcing an older version of the Facebook IPA allows you to manually install a version of the app that was compiled back when Facebook still officially supported iOS 12. Method 1: The Official (Safe) Bypass via App Store

Note: If you have never downloaded Facebook on this Apple ID, log into your Apple ID on a friend's newer iPhone (running iOS 13 or later), download Facebook there first, then return to your old phone. The app will now appear in your "Purchased" history.

Download the Facebook IPA file directly onto your iOS device using Safari.

Also, possible issues with the update, like crashes, might prompt the user to seek a specific version. If 125.5 was unstable, they might want to go back. But Apple doesn't allow installing older versions unless via backup. So maybe the user heard about 125.5 from somewhere specific, like a beta program.

Since a direct download isn't readily available, you have a few options for finding a compatible version:

If your device is jailbroken, install AppSync Unified from Cydia to allow installation of unsigned IPA files, removing the need for 7-day re-signing. Alternatives for iOS 12.5.5

Apple officially stopped major software support for devices powered by the A7 and A8 processors at iOS 12. Over time, app developers update their minimum system requirements to leverage newer iOS APIs and security features.

Method 1: Sideloading via Sideloadly or AltStore (PC/Mac Required)

The primary reason you are looking for an IPA (iPhone Application Archive) is that the official version of Facebook now requires iOS 13.4 or later

Navigate to the section (click your profile icon). Find Facebook and tap the cloud download icon.

Note: This only works if your Apple ID has downloaded Facebook in the past. Finding a Reliable Facebook IPA File

This is where an becomes essential.

Before using third-party IPA files, try the official App Store workaround. This method is safer and does not require a computer. Open the on your iOS 12.5.5 device. Tap your Profile Icon in the top right corner. Select Purchased (or My Purchases ). Use the search bar to look for Facebook . Tap the Cloud Icon next to the app name.

Download Facebook IPA for iOS 12.5.5: Legacy Guide Older Apple devices like the iPhone 5s, iPhone 6, and iPad Air 1 are locked out of modern App Store updates. These legacy devices cannot update past iOS 12.5.5 or similar iOS 12 revisions. Because the official Facebook app requires newer iOS versions, users must look for compatible IPA files to keep their devices connected.