General flashed to metro pcs and rooted EVO 3D

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http://androidforums.com – I have a rooted htc evo 3d android 2.3.4 htc sense 3.0 and it is flashed to metro pcs is how can i update my evo 3d to the newest android and sense and my mms doesnt work. I dont want to really flash roms since theres always something not working i dont care about 4g or 3d but i do care bout everything else i just want actually updates for these please help.. i really want mms to work please help (General)