Android Installation
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Click Download
Tap the "Download for Android" button. If your browser warns that the file may be harmful, select "Download anyway." This is a standard warning for all APKs from the web.
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Enable Unknown Sources
Open the downloaded file. Android will prompt you to allow "Install from unknown sources." This means you are permitting the install of an app not from the Play Store.
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Confirm Permissions
Go to Settings > Security and toggle the switch for your browser to allow installations. This confirms you trust the source of the 999pub application.
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Complete Install
Return to the installer and tap "Install." Once finished, the 999pub icon will appear on your home screen, ready for your official login.