HTC is now rolling out Nougat update 2.18.651.2 for Sprint’s HTC One A9. Last month, HTC announced the Nougat rollout for the One A9 in the US. You will see new HTC One A9 update 2.18.651.2 with 1.86GB ROM download size.
Before you proceed, please confirm that this software upgrade to 2.18.651.2 is a newer version than what is currently loaded on your device. Navigate to the Home screen, then tap All apps > Settings > About and locate the Software information. If your Software number is less than 2.18.651.2 , you should proceed with the upgrade.