How To Upgrade Rom For Mi Max ?

Jul 12, 2016
I am already on ROM version 6.7.7.

The ROM version 6.7.14 is now available. How do I upgrade ( and preserving data and configuration ) ?

Do I just run updater and select the new ROM or I have to go to TWRP recovery and install the new ROM ?

Do I have to wipe the cache as well ?

Is there a OTA upgrade of this series of ROM version ?