If you still wish to proceed, here are the most effective community-tested methods: What operating systems are supported by the Facebook app?
— You cannot directly install a specific old build number (1255) from the App Store. iOS always downloads the latest compatible version for your device. facebook old version for ios 1255 install
Using tools like , SideStore , or Sideloadly , you can install an old .ipa on a non-jailbroken iPhone running iOS 14, 15, 16, or 17. If you still wish to proceed, here are