You can ota with root if you meet the following requirement:
1)you don't have any mods
2)you don't use xposed
3)you haven't removed bloat
4)you have not modified system partition in other words the system folder
5)and most importantly you do not have custom recovery, for ota to work you need the stock recovery to work
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?