Cube 60Pro ac - No Green Light - just blinking blue...

Can anyone advise regarding a Cube 60Pro ac - AKA Wireless Wire Cube Pro:

I suddenly no longer have an ethernet connection, and only the blue light is blinking.
Normally I also see a green light.

I did upgrade it to v7.15.1 about a week ago.
Then it seems to have failed.

There has been some mention about ethernet issues on v7.15 - but I can’t seem to find any details.