If your Note3 is still running on MIUI6, time is here to update it to MIUI7.
Best way of updating your device is the OTA method. Look under Settings, update device and you should see the update.
However if you do not see it yet, you should be able to download the update package from here
Note 3 download package
Best way of updating your device is the OTA method. Look under Settings, update device and you should see the update.
However if you do not see it yet, you should be able to download the update package from here
Note 3 download package