If you have an iPhone X or newer, stay on the modern version. The features you lose (video calling, stories, marketplace buying) outweigh the speed gains.
If you specifically need a version like (or similar older builds) because the "last compatible" version is still too heavy for your device, you are entering "Advanced Territory." This requires using third-party tools like iMazing or AltStore on a computer. facebook old version for ios 1255 install
Despite Facebook’s billions of users, many feel the modern app has become bloated, confusing, and privacy-invasive. Specific complaints driving the search for version 1255 include: If you have an iPhone X or newer, stay on the modern version
Legitimate sources often include Internet Archive or developer forums. Be extremely wary of malware. Look for files with MD5 checksums posted by trusted iOS modding communities. facebook old version for ios 1255 install