If the App Store trick fails, you will need to manually install (sideload) a modified or archived Facebook .IPA file using a computer. Prerequisites: A Windows PC or Mac computer. A lightning or 30-pin cable to connect your device. An archive of a Facebook IPA verified for iOS 9.

Note: Free Apple ID signatures expire every 7 days. You will need to plug your device back into your computer every week and repeat this process to keep the app working, unless your device is jailbroken.

Search for "Facebook" within your historic purchase history. Tap the .

If you have found a specific legacy IPA file (version 20.0 to 30.0 are generally more stable for iOS 9), you can install it using a computer: Sideloadly Cydia Impactor (if updated).

The App Store should prompt you: "Do you want to download the last compatible version?" Tap . This ensures you get a version signed directly by Apple. 2. Bypass Login Issues with Two-Factor Authentication (2FA)

: This is a jailbreak tweak found in Cydia that forces the App Store to show the "download last compatible version" button for apps that would otherwise show as "incompatible".

To get Facebook on a device running iOS 9.3.5, you can typically download the directly from the App Store without needing an external IPA file . Method 1: Using the App Store (Recommended)

If your iOS 9.3.5 device is jailbroken (typically using the Phoenix jailbreak tool), you can bypass the 7-day signing restriction entirely. Open on your jailbroken iOS 9.3.5 device.

The native App Store checks your iOS version before downloading. If the app requires iOS 13.0 or higher, it will block the download instantly.

If the standard App Store method fails, legacy users often turn to specialized tools: