Last year Android Nougat at that time. Asus has a very poor firmware update record in of the Android and security patch. The company uses their own ZenUI custom skin on their devices and typically they’re not used to of providing monthly or quarterly updates.
Recently, almost five months ago the company released their first ever stock Android device called Asus Zenfone 3 Max device.
Android Oreo Rolling Out For Asus Zenfone 4 Selfie
Yesterday on October 11, Asus released the ZenUI 5.0 skin.
The update brings PIP (Picture-in-Picture) mode, autofill API, improved notifications, redesigned Settings, wallpaper slideshow on the lock screen, Smart Screen On, Suggested Apps, Scheduled Charging, Mobile manager, OptiFlex 3.0 for RAM/App optimizations, Game Genie, Twin Apps, Face Unlock, and more.
The update will take around a couple of weeks to arrive all devices. So kindly be patient and if you didn’t get any notification about update then check it manually. Go to Settings > About > System Update and see whether the update is available or not.