For Android Users (APK)
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1.
Enable Installation
Go to Settings > Security. Enable the "Install from Unknown Sources" option to permit the app installation.
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2.
Locate APK File
After downloading, open your 'Downloads' folder and find the file named fb777-app.apk.
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3.
Install & Launch
Tap the APK file. Press "Install" and approve the permissions. The app will then appear on your home screen.