Asus, not long after the release of the Android 4.4 KitKat update for the ZenFone 4. Asus re-rolling the Android 4.4.2 KitKat update for the Asus Zenfone 5 and ZenFone 6 both devices was faster than that reported this background, which is planned to start rolling in early 2015.
Currently, the Android 4.4.2 update for ZenFone 5 and Zenfone 6 have been rolled out via OTA to the territory of China and Taiwan with a file size of 456.62 MB. So, if you do the update we suggest to use a WIFI network to save your data packets. Unfortunately, information regarding this update will be rolled out globally or still not yet announced by Asus.
Source: Fone Arena