Default Android version and signal

I've been wanting to use the KitKat ROMs available for this device but I always end up back on 4.3 because my device never displays DCHSPAP for its data speed on any of the KitKat ROMs and I was curious why. I am on the T-Mobile network with the AWS mod and if I'm on stock or any OS under KitKat I have a full signal with DCHSPAP but if I use a KitKat ROM my phone shows 3G and occasionally H and UMTS or HSPA in about phone.

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