Default Metro pcs 4.3 update?

I can't seem to find a forum for the metro pcs Samsung galaxy s3 Sch-r530m so this is the only place I figure I can post. I've been trying to find a manual update being every other s3 has 4.3 and have been unsuccessful. I would like to root my phone for it I currently have 4.1.2 and don't know where to start. I have researched quite a bit but a lot of it is confusing and I don't wanna brick my phone. Any help or guidance would be greatly appreciated thanks!

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