Following its delay last week, T-Mobile has at last officially started rolling out the much-anticipated Android 4.3 over-the-air (OTA) update to all of its carrier-branded HTC One handsets located in the U.S.

The HTC One max has already been confirmed for Sprint and Verizon following its debut in the U.K. this month, but it appears the super-sized smartphone is also headed to AT&T. A press render that clearly shows the handset’s AT&T branding has been published online ahead of its official debut.

HTC has confirmed that its Android 4.3 update will be reaching HTC One handsets in the United Kingdom in “3-5 weeks.” The news comes just days after the Taiwanese company began rolling out the new software in the United States and Canada.

Last week, the President of HTC America, Jason Mackenzie, took to Twitter to announce that the much-anticipated Android 4.3 update for the T-Mobile U.S. branded HTC One would roll out by the “middle” of last week. But unfortunately for T-Mo customers that did not happen as planned. For an unspecified reason, the update has been unexpectedly delayed until today, Monday, October 21, when it is expected to roll out sometime before this afternoon.

HTC finally unveiled the One max earlier this week following months of rumors and speculation, and the Taiwanese company said that the device will be “rolling out across the globe from mid-end October.” One place it won’t be visiting, however, is Canada — because they already have enough HTC devices to choose from, according to HTC.