If your screen(s) continuously display the Configuration Update message follow in this article. This error is usually caused by the screens and/or data being out of sync with the server.
Check to ensure all screens are on the same firmware and that there are no IP address conflicts:
The IP addresses should all be unique and in the same range. If there is a conflict, it is usally displayed in red.
The firmware versions should all be the same.
Restart Application, Reboot Device, Power-off/on Device, and Reconnect to Server on all of the affected screen(s):
Perform a Factory Reset on the Screen
Rewrite the SD Card
Rewrite the SD Card, preferably to a new card, for the affected screens.
If the steps above did not resolve the issue, gather log files for investigation by development and discuss possible hardware causes.