MMS Problem For MetroPCS Flashed HTC One

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http://forum.xda-developers.com – I'm running a flashed HTC One to Metro PCS, 3G, text and talk all are working but MMS is not. Also, "Access point names" under mobile network settings is greyed out and cannot be accessed. Any advice is greatly appreciated it. I'm really interested in finding out how to unlock the "APN" option in settings.. (HowTos)