Highly recommended. It verifies that the app signatures match the official developer (Meta/Facebook) to ensure the file has not been altered.

Staying connected with friends and family is essential. However, if you are running an older device with Android 5.1 Lollipop, finding the right version of Facebook Messenger can be challenging. Meta frequently updates its applications, often leaving older operating systems behind.

Testing checklist

Prevent the app from constantly eating up mobile data by going to Settings > Data Usage > Messenger and restricting background processes.

Android 5.1 (Lollipop) , installing the modern Facebook Messenger app is often restricted because current versions typically require Android 9.0 or higher

If the app opens but runs incredibly slow, your hardware is likely struggling with the software load.