I just learned from a Facebook post that the new VX cards are updateable. There is a new ChartSelect Windows and Mac app you use to perform the updates. I just checked my VX Southeast Premium card and it said that it was up to date. You can also update the ZeroLines card through this app as well.
The details on the process (as well as the links to download the Windows or Mac software) are in the following Humminbird web link:
https://chartselect.humminbird.com/vxinstructions