What's the cid of the phone you got the sense 6 update on please?
But it's so easy to check... https://play.google.com/store/apps/details?id=org.tritonsoft.cidgetter
Did you have any problems after the update? Is everything still there? Any apps missing from 5.5?
Is the One worth the upgrade from a One X?
Got the chance to pick one of these up relatively cheap.
£230.
4A.25.3263.21_10.38x.1157.04L on mine
Have you tried updating the firmware? In the end, that's what fixed my 4G issue: http://forum.xda-developers.com/showthread.php?t=2485651
Correct me if I'm wrong, but isn't that the Sense 6 firmware?
I believe it's compatible with any KitKat ROM, but there's a link to all the previous firmwares too. It only contains radio, hboot etc.