HTC One M9 Plus update: 2.15.709.1 is Prime Camera edition's Marshmallow upgrade
HTC One M9 update tracker - Android Authority
HTC on Twitter: "So sweet. Android Nougat—the next version of Google's Android—will be coming to the HTC 10, HTC One A9 & HTC One M9. https://t.co/cB5S2zv0PW" / Twitter
Update HTC One M9 to Android 6.0 Marshmallow Firmware with RUU
Verizon starts rolling out Android 7.0 Nougat update for the HTC One M9 - PhoneArena
AT&T's HTC One M9 will soon get its Android 7.0 Nougat-flavored upgrade - Android Authority
Download Install 4.49.605.11 Android 7.0 Nougat For Verizon HTC One M9
How to Update HTC One M9 to Android Nougat Manually - Android - Learn in 30 Sec from Microsoft Awarded MVP
Android 7.0 Nougat coming soon to HTC One M9 on AT&T - NotebookCheck.net News
AT&T's HTC One M9 is now getting the Android 7.0 Nougat update - GSMArena.com news