Today, HTC VP of product Management, Mo Versi took to Twitter to announce that AT&T users of HTC One M8 and One M9 will start to seen Android Marshmallow update for their devices shortly. This update comes after some long delays in being finalized, but either way it is great to see it will be hitting phones shortly.
HTC One (M8 & M9) AT&T owners! Thank you for your patience. Marshmallow OS is approved, OTA to start tomorrow!!
— Mo Versi (@moversi) May 11, 2016
If you own either of these phones, do not get surprised when the update shows on your screen. Also, note that the update will be released in batches, meaning not everyone will get it on the first day.
Since downloading software via a mobile network may result in additional charges, it is better for you to use a Wi-Fi connection when downloading software updates. You have to remember that firmware updates require at least 3GB of free space in your phone and also make sure that your battery is fully charged or at least 70% so that your phone will not turn off while downloading or updating software. You can read how to update your device via OTA by visiting here.