Update the e-mark App
Whenever there is a new update for the e-mark App, it is recommended to update it (via Google Play Store or App Store), because the functionality may be extended or probable bugs may be fixed. Depending on the settings in your respective app store you will receive an automatic notification for making the update.
Update the software on the e-mark (=firmware)
In addition to the App, also the software on the e-mark is improved from time to time. This software is called firmware. The update can be made through the App. A notification will pop up when opening the App, which needs to be confirmed in order to make the firmware update of the e-mark.