Asus has now released a new update for the ZenFone 5 (Model no. ZE620KL) with Improved Camera Stability, new Navigation Bar Gesture Function, and a splendid new function.
The new update for the ZenFone 5 ZE620KL will be rolling out via FOTA so, please keep patience as it might take some days to be available for your device.
If you want you can manually check for the FOTA update on your ZenFone 5 by stepping to Settings >> System Updates >> System and check if there is new firmware available or not.