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Galaxy note 4 will not boot properly

Hi everyone,so i was given a note 4 that had a booting up problem. it was originally my girlfriend's sister and she told me that when ever it turned off(either out of battery or manually) it would have a hard time booting up. when attempted to turn on it will show theSamsungGALAXYNOTE4powered byANDR

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How do I prevent unknown devices from using my wifi

I know about changing my password ands SSID and all that. I need something that will let me boot unknown devices off the network and ban them, without having to change password/SSID every time. Or better yet tell me why AT&T modems (Pace) seem to be more suseptible to break ins than others! 🙂

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