HTC has started rolling out a new update for A9 which bring Android 7.0 Nougat update in India. This smartphone was launched last year in Indian market. The new update comes with version 2.18.707.1 along latest google security patch inside.
— Nav 💚HTC™ © (@neelgaganslg) April 20, 2017
Aside from Nougat OS, it comes with some system enhancements and several bug fixes. It will definitely improved device performance and will fix some important glitches in device. It weights around 1GB in size. If you are owning A9 in India you can install this update if update notification still not appear in your device you can check it manually by visiting Setting Menu > About > Software Updates
As usual, OTA update takes some time to reach on device so don’s worry if you did’t got update notification. Hopefully, company will push this update to all needed device.