Back in the summer, Samsung said some devices that are over two years old would receive the Android Oreo update, starting December with the Galaxy J7 Neo, followed by over ten phones in January 2019. One of the devices on that list was the Galaxy A9 Pro (2016), but according to sources, some units in Vietnam have already started receiving the new OS, paving the way for all the other devices. The OTA package is 2.09 GB in size which might be troublesome for users that are already nearing their 32 GB storage capacity. The rollout is in stages, so it might take some time to reach everyone...
Source: https://www.gsmarena.com/samsung_oreo_update_galaxy_a9_pro_2016-news-33734.php
