Router Apps can extend the features of the device above the firmware features.
If you want to add more Router Apps, click on this icon.
To keep a specific Router App and version in device, pin it. Pinned Router app will be always synced in the device - if the Router App is deleted or updated localy in device, it will be installed back to pinned version immediately when synced with DMP again.
Firmware can be pinned the same way.