Standard Facebook app updates stopped supporting Android 4.1.2 years ago. The last official mainstream version confirmed to support was v281.0.0.36.124 , released in August 2020.
If you have a compatible device and need this specific build, you can find it on reputable archival sites like 3. Summary of Options for Older Devices Compatibility Best Use Case Facebook Lite Android 4.0+ Best for performance on old tablets/phones Mobile Web Any Browser m.facebook.com if apps fail to install Legacy APKs Android 4.1+ facebook apk android 412
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