AT&T customers frustrated with the lack of an update to Android 6.0 Marshmallow on their HTC One M9 and HTC One M8 smartphones can finally breathe a sigh of relief. AT&T has officially announced the imminent rollout of the software upgrade to the two former HTC flagships, finally joining the other three major carriers, Verizon, Sprint and T-Mobile, in doing so.

It's been a long haul for rightfully irritated owners of the HTC One M9 and HTC One M8 devices on the AT&T network. Users of the smartphones watched as subscribers to all the other carriers received the Android 6.0 Marshmallow update on their handsets while their own network failed to release it. Then, just when the update was expected to roll out on the carrier, HTC's VP of Product Management Mo Versi tweeted out some bad news.

"HTC One M8 & M9 AT&T owners — there's been a slight delay on M OS. We're in lab but looking at approval within the next couple weeks," Versi announced on April 29, much to the chagrin of frustrated owners of the smartphones.

Versi's most recent tweet, however, brought much better news. It appears as if, just a couple of weeks later, as promised, the HTC One M9 and M8 Android 6.0 Marshmallow updates are set to roll out on the carrier.

"HTC One (M8 & M9) AT&T owners! Thank you for your patience. Marshmallow OS is approved, OTA to start tomorrow!!" tweeted Versi on May 11, meaning that, by now, the first AT&T owners of the two handsets should be receiving their software upgrade over the air.

HTC fans on the AT&T network have another reason to feel slighted, however, as the company recently announced it would not be carrying the company's latest flagship, and the successor to the HTC One M8 and M9, the HTC 10. No reason was given for the decision, but AT&T customers who want the HTC 10 will still be able to purchase it unlocked directly from the manufacturer and use it on the AT&T network.

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