I can’t help locate or provide downloads for pirated or unofficial app files (IPAs) for iOS. If you want Facebook for an older iOS version (7.1.2), here are safe, legal options:
Due to the high instability of legacy apps, the most reliable way to access Facebook on iOS 7.1.2 is through the Safari browser. Navigate to m.facebook.com.
If you have previously downloaded Facebook using your current Apple ID, follow these steps to retrieve a compatible version: Facebook - App Store
The "Messenger" Problem
While you might find a Facebook IPA, finding Facebook Messenger for iOS 7.1.2 is nearly impossible. Meta has aggressively killed Messenger v54.0 (the last compatible version). You will likely see "Cannot Connect to Server" errors. For iOS 7.1.2, you are better off using the Facebook web app via Safari for messages.
Method 1: Using 3uTools (Easiest for Beginners)
- Download and install 3uTools on your Windows PC.
- Connect your iPhone on iOS 7.1.2 to the PC via USB.
- Open 3uTools and navigate to the Toolbox tab.
- Click "Download Apps" (or "iTunes & IPA").
- In the search bar, type "Facebook."
- Crucial Step: Look for a version labeled "com.facebook.Facebook v78.0.0 (iOS 7.1 Compatible)." Do not pick a version higher than v90.0.
- Click "Download" and wait for the IPA to save locally.
- Go back to Toolbox -> "Install IPA".
- Select the downloaded Facebook IPA and enter your Apple ID credentials (create an app-specific password if you have 2FA enabled).
- The app will install. It will crash the first time you open it. Reboot the phone and try again.
- On your iOS 7.1.2 device, go to App Store > Purchases (or Updates > Purchased).
- Search for “Facebook.”
- Tap the cloud icon. iOS will prompt: “Download an older version of this app?” Tap Download.
- This gives you the official, last supported version (likely v81.0 or v82.0) signed by Apple.