Forget the number and focus on the goal: finding a stable, compatible, and safe version of Facebook for your Android device.
If you landed here searching for you are likely trying to solve one of three problems:
While the number "4120005" appears to be a specific build identifier, it generally points to a narrow window of Facebook builds released in the early 2020s or late 2010s. Users searching for this specific tag are usually trying to pinpoint a "sweet spot"—a version of the app that is new enough to support login security protocols but old enough to avoid the bloat and system resource demands of the 2024 updates. facebook 4120005 apk older versions for and work
Go back in time. Run Facebook smoothly on older Android devices.
If login fails, try signing in using a different method (phone number vs. email) or check if you need to enable "less secure app access" in your Facebook account security settings (though this is rare now). Forget the number and focus on the goal:
This specific alpha build was designed to target Android 13 (API 33) but maintains a minimum requirement of Android 11 (API 30) for certain variants.
Because security architectures restrict unauthorized application installations by default, users must manually configure storage permissions to deploy local packages. Phase 1: Prepare the Device Environment Open the primary device panel. Select Apps or App Management . Locate and select the current version of the Facebook app. Go back in time
: If legacy standard builds still cause device slowdowns, download Facebook Lite 412.0.0.8.106 or newer iterations. It is designed to work efficiently on weak mobile networks and legacy hardware.