This usually means you tried to install a version that is too new. Look for an older version of the APK.
To get Facebook running on an Android 4.1.2 (Jelly Bean) device in 2026, your best options are using Facebook Lite or a dedicated legacy browser facebook apk for android 412
Another highly reputable source for verified, safe legacy APKs. You can filter by "Minimum Android" version to find 4.1-compatible builds. Installation & Security Warnings Enable Unknown Sources: You must go to Settings > Security and toggle on Unknown Sources to install an APK file directly. Avoid Malware: This usually means you tried to install a