If you are holding onto a reliable older smartphone or repurposing a legacy device, you may have noticed that the modern Facebook app no longer supports your hardware. The current version of Facebook requires newer Android systems, leaving Android 4.1.2 (Jelly Bean) users locked out of the standard Play Store update.
Because the Google Play Store blocks this version, you must use a trusted APK mirror. Do not download from random popup websites. Download Facebook For Android 4.1.2 BEST
Official sources and community reports indicate it supports versions as far back as Android 2.3 Performance: How to Download and Install Facebook on Android 4
Conclusion:
Performance Issues: Expect slower load times and occasional crashes. Legacy hardware struggles with the heavy media content found on modern Facebook feeds. Go to App Settings > Media & Contacts