On this page you can find the information how to update.

N870/N670 - Release 2.20.0  Software version 2.29.1  Software version 2.26.0 N870/N670 - Release 2.20.0  Software version 2.23.0N870/N670 - Release 2.23.0 N870/N670 - Release 2.20.0  Software version 2.20.0N870/N670 - Release 2.20.0