HTC is being pretty fast with the updates on the HTC One. The company has started rolling out the Android 4.3 update for unlocked HTC One and for the HTC One Developer Edition in US from today. The Android 4.3 update was first rolled out in Taiwan two days ago, and is now followed by US. With the update having been noticed by users to be rolling out globally, though no official statement has been released yet by HTC.
As soon as your HTC One is ready for the update, you will be notified automatically. Those who have not yet received the update can ping HTC's servers manually by going to Settings > About > Software Updates > Check Now.
If you have received the Android 4.3 update on your HTC One unlocked/developer edition, then do let us know your review about the update below.
Source - XDA
Via - GSMArena
Image Credit - Droid-life