Most 2015 flagships (Galaxy S6, Note 5, Nexus 6P) are arm64. Download the arm64-v8a variant. For older chips (Snapdragon 400), use armeabi-v7a .
For the smoothest experience on Android 5.1, look for . If you need the full-featured app, you will likely need to sideload an older APK from a reputable site like APKMirror.
For , the standard Facebook app is no longer officially supported, as current versions typically require Android 6.0 or higher . While you can still find legacy APK files that function on this version, the experience will likely be slow or limited by security vulnerabilities. Recommended Option: Facebook Lite
The most reliable way to use Facebook on Android 5.1 is . It is designed specifically for older hardware and slower networks. Facebook Lite for Android - Download the APK from Uptodown
To Leo, this isn't just an app; it's a time machine. As he side-loads the APK, he’s transported back to a time when: The Interface was Flat:
Transfer Complete.