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

N870/N670 - Release 2.20.0  Software version 2.20.0N870/N670 - Release 2.20.0  Software version 2.17.2N870/N670 - Release 2.17.2 (Intermediate release)  Software version 2.16.2N870 - Release 2.16.2 (Intermediate release)  Software version 2.14.0