Following the start of the over-the-air rollout of the update to Android 7.0 Nougat for supported devices yesterday, Google has now made factory images and OTA zip files available for those who don't like to wait for the update notification. This is no surprise in itself, since it's Google's usual way of doing things. What is slightly different than usual is that it took the company a whole day to do this, and also that for the time being factory images and OTA zips are only available for three of the supported devices. These are the HTC Nexus 9 (Wi-Fi-only), the Google Pixel C, and...
Source: http://www.gsmarena.com/android_70_nougat_factory_images_and_ota_zip_files_are_now_available-news-20103.php