How do i get 4G lte working with the fingerprint sensor on my XZ Premium?

I purchased the US model for the warranty and just flashed the UK firmware from XperiFirm so now I have the fingerprint sensor. My issue is now I can only get 4g / H+ to show and I'm getting speeds of about 5 Mbps. I switched from my HTC M8 and it was getting lte all the time with 60+ Mbps. I'm assuming it's due to the uk firmware so does anyone know how to get both to work? Thanks.

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