Thus, the last official Facebook version that fully supported Android 5.1 was (released in late 2021). After that, updates required at least Android 8.0.

This usually means the APK you downloaded requires a higher Android version than 5.1.

If you are in a region where it is available (or can find the APK), is the best option.

Instead, you need to find an of Facebook that still supports Android 5.1 Lollipop as its minimum requirement.

The standard, full-featured Facebook application dropped support for Android 5.1.

Follow these instructions carefully to install Facebook on your Android 5.1 device:

This comprehensive guide covers everything you need to know about finding, downloading, and installing a compatible Facebook APK for Android 5.1. Why the Google Play Store Fails on Android 5.1

If APKs don’t work or feel unsafe, use the browser version.

Facebook Lite was designed specifically for older devices, low RAM, and 2G or 3G networks. Fortunately, Meta continues to support older Android versions for the Lite application much longer than the standard app.

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