Use this app to check your CID: https://play.google.com/store/apps/d...soft.cidgetter

What CID does it say? For UK unbranded, unlocked handsets it's HTC__001. I got the update just fine.
HTC One M7 - Sense 6.0, Android 4.4.3, Stock Kernel - Active
Google Nexus 10 - Android 4.4.4, Stock Kernel - Active
Sony Ericsson Xperia PLAY - CyanogenMod 11.0, Android 4.4.4, CM 11.0 Kernel - Semi-Active