If sideloading feels risky or the app still runs poorly, consider these alternatives that work flawlessly on Android 5.1:
A: Yes, as long as the APK is unmodified and redistributed legally. Facebook’s Terms of Service do not prohibit sideloading their free app.
This is the safest way to get an old version of Facebook that still works with Android 5.1. apk facebook android 5.1
Step 1: Enable "Unknown Sources"
Step 2: Download a Compatible Facebook APK If sideloading feels risky or the app still
Step 3: Install the APK
Step 4: Log in
Report prepared by: Compatibility Lab, Mobile Security Division
Next review: None – product permanently end-of-life.
| Error Message | Solution | |---------------|----------| | “App not installed” | You already have a newer version installed. Uninstall the current Facebook app first. | | “Parse error” | The APK architecture is wrong (e.g., you downloaded arm64 for an armv7 device). Download the “universal” version. | | “App keeps stopping” | Clear cache: Settings → Apps → Facebook → Storage → Clear Cache and Data. | This is the safest way to get an