If you prefer the classic look of the full Facebook app, you will need to hunt for an "old version" APK. Versions released around 2014 or 2015 (generally version numbers ranging from 20.0 to 40.0) were the last to offer stable support for the Jelly Bean architecture.
: This remains the most viable option. While the newest versions of Facebook Lite often require Android 5.0+, Meta has historically maintained Lite APKs that work as far back as Android 4.0 .
: For Android 4.1.2, you almost certainly need the armeabi-v7a variant of the APK. If you'd like, I can help you: