Question 4g help?

hi, im looking to see how to get 4g set up on my htc one.

im with the network, 3 based in UK
i know they still rolling to places however manchester has it. was there past 2 weeks and
checked coverage in area i was around and has been fine yet no 4g. phone only showed either 3g or H

the website states about settings would have been changed so it would show in mobile networks as like GSM/WCDMA/LTE auto.
which in my case it did but i didnt see any changes whatsoever. now i also see some description about software update and during quick google search bumped into this

https://www.facebook.com/ThreeUK/posts/755107707837518

now im wondering cause im using custom rom (no options for about > software update in settings)
how do i go about this so called software update to 4g?

anyone on 3 network with some insight..?

thanks much appreciated



A man doesn't know what he knows until he knows what he doesn't know.