- Feb 6, 2017
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If he went back to carrier firmware he would have Samsung messages RCSThat I can't say. TMobile has been very hands off when it comes to customizing OneUI. ATT is bad for other devices so I wouldn't be surprised if they stripped it.
Unfortunately unless someone else here knows the only way would be to flash U1, start from scratch and test but that's a lot of work for something that may or may not work.