LTE: I could use some help, what am I doing wrong?

Jan 18, 2015
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Hello all,
I was wondering if someone can help me. It seems that no matter which rom I install on my Moto G4 Plus (XT1644) I can’t seem to get LTE working. I only get 3G, I feel like I’m doing something wrong. I don’t know if this helps or not, but my service provider is Sprint. I’ve tried *#*#4636#*#* and cycled through different network types and this hasn’t helped. I’ve also tried reverting to the stock rom so I can update the PRL and reinstall a custom rom; this also does not work. Any suggestions would be helpful and greatly appreciated, thanks in advance!

The bootloader is unlocked
TWRP is flashed

Note: I’ve tried searching through the forums, but most of the useful information is not for the XT1644 variant.