At the moment, there are 2 ways :
1. Orange banner
The orange banner is shown on the top of the smartphone screen once XpertEye is loaded. You just have to accept the update.
2. Additionnal menu
You have to access to Android external applications first.
1. Click on the settings icon.
2. Click on "about phone"
3. Click on "Additionnal system updates"
4. If your XpertEye version is not up to date, an update will be possible, otherwise, "your XpertEye version is up to date" will be shown.