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It runs efficiently on devices with less than 1 GB of RAM.

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Older devices run on ARM or x86 processors. Ensure the APK variant you download matches your phone's processor architecture (usually ARM/armeabi-v7a for Android 4.1.2). It runs efficiently on devices with less than 1 GB of RAM

You will have to find an equally old version of Messenger (Version 50 or lower) to chat with friends. Option 3: The Mobile Browser Alternative (The Safest Route) Download Facebook For Android 4.1.2 BEST