Thanks a lot for clarifing that.
I’m not sure, if I can follow the link @sihui recommended because the first step in the linked tutorial is to do sudo apt-get update && sudo apt-get upgrade
but actually always when starting openhabian-config I get this warning:

And if I finally make it one further question just to clarifiy:
When RPi3 is booting from ssd: Can I still use openhabian-config with option “Upgrade system” to keep my system up to date?
I’m asking because of that treat: Because the new USB mass storage boot mode is provided through beta firmware you can‘t upgrade your system with apt-get upgrade anymore.
Sorry, but I’m confused, because you have to pay attention to so many things.
(Managing all this with openhabian-config would be a great thing.
)
My system is:
openHABian Configuration Tool [master]v1.3-291(308a39f)
