While it may seem like only Nexus devices are able to get a sweet preview of Android Nougat in the form of developer preview builds, other OEMs have to test their own builds internally in order to release timely updates. Well someone at Huawei dropped the ball and accidentally released an OTA for the Huawei P9. Well, the developers over at XDA have captured the OTA link (meaning they were able to find the source of the leaked update). They have since compiled a post with screenshots and download links so you may enjoy the Android Nougat-ey sweetness in the form of your Huawei P9. Here's...
Source: http://www.gsmarena.com/leaked_android_nougat_beta_build_for_huawei_p9_shown_in_video_ota_links_too-news-19646.php