mobile

Bought my htc one m7 (sense 5.0) on amazon. It is a At&t unlocked phone which I'm using on T-mobile. I heard that AT&T rolled out lollipop OTA updates. However, I get a message "No update is available for your device." I'm attaching screen shots for the details. I'm really looking forward to updating to Lollipop. Any help is appreciated. Thanks in advance.

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