Why does my device status say custom?

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My device status says "custom"

I have a Samsung Galaxy Note 3 N900, my status says "custom" and I can't seem to upgrade to Android Lollipop when it has been out for months for my ATNT phone. I bought this used phone off eBay, and it had been rooted by the previous owner. I uninstalled root, but it still says "custom". Also, when I boot up my phone, along with the name of the phone, their is a unlocked lock symbol with the words " custom" under it. What should I do to get the ATNT Andriod Lollipop??