: This determines how the app scales on your screen. If you aren't sure, selecting a variant designed for a standard range (like 280-640dpi ) usually works well.

Highly secure, mirrors the exact files found on the Play Store, and allows you to filter versions by minimum Android architecture (look for "Android 5.0+").

| Vulnerability | Severity | Description | |---------------|----------|-------------| | | Critical | No backported fixes for CVE-2023-28121 (account takeover via OAuth) or CVE-2024-13057 (WebView RCE). | | Deprecated TLS | High | The app uses TLS 1.2 only. Modern Facebook servers prefer TLS 1.3, leading to occasional downgrade attacks. | | Unpatched WebView | Critical | Android 5.1's System WebView (Chromium 49) contains known RCE vulnerabilities (CVE-2016-1663, etc.) that the Facebook WebView wrapper inherits. | | Local data storage | Medium | App data stored in /data/data/com.facebook.katana/ is not encrypted by default on Android 5.1 (no native encryption support). |

He clicked on a photo. It opened instantly. No loading circle, no "HD" prompt. Just the image.

Facebook Lite was built specifically for older devices, low RAM, and 2G networks. It uses minimal data and resources.

: Lists specific builds like 114.0.0.20.70 that are compatible with the ARM architecture on Android 5.1.

Before downloading an APK, decide which version best suits your device's hardware constraints. Option 1: Standard Facebook (Archived Versions)

The APK requires a newer version of Android (e.g., Android 6.0+). Download a lower version number or switch to Facebook Lite.

Downloading Facebook APK for Android 5.1 (Lollipop): The Complete Guide

Facebook Lite was designed specifically for older devices, low RAM, and slow 2G or 3G networks. It still supports older Android versions.

: If you update the app via the Play Store, it will likely upgrade to an unsupported version and stop working. Open the Google Play Store, go to the Facebook app page, tap the three dots in the top right, and uncheck Enable auto-update .

The safest platform for old app versions. Search for "Facebook Lite" or "Facebook" and filter by Android 5.1 compatibility.

You need a of Facebook (roughly v.350.x or earlier, from around 2020-2021). Here is how to do it safely.

: The latest version of the standard Facebook app requires Android 6.0 (Marshmallow) or higher.

The Ultimate Guide to Downloading Facebook APK for Android 5.1 (Lollipop)

This error means the APK file is corrupted or incompatible. You likely downloaded a version meant for a newer Android version (like Android 10 or higher). Delete the file and download a legacy version specifically marked for API 22 or Android 5.1. "App Not Installed"