Galaxy A9(pro) 6: How to enable LTE radio bands for T-mobile (US)?

I've done some research and realized that there is a way to enable radio bands that are locked.

I would like to get 4G LTE in the US for T-Mobile. Currently, only 4G is available.

Does anyone know how to do this for Galaxy A9(pro) 6?

Thanks a lot,

Kevin

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