For a brief period (2014-2018), Apple allowed you to download "last compatible version" if you had previously downloaded an app.
To reliably get to work, you need an .ipa file (iOS App Archive) of that specific version and a sideloading tool. facebook old version for ios 1255 install
If Facebook is not in your "Purchased" list, the App Store may block the download. You can bypass this by: For a brief period (2014-2018), Apple allowed you
: A popup will ask, "Download an older version of this app?" For a brief period (2014-2018)
If you have downloaded Facebook before using your current Apple ID, follow these steps:
Installing the Facebook app on devices running iOS 12.5.5 (like the iPhone 5s, 6, or 6 Plus) is challenging because the current app officially requires iOS 13.4 or later