Trying to update the firmware because the DMZ setting was not saving or at least was being reset to disabled despite my best efforts to save it into the modem. A restart seemed to be ok, but a while later the DMZ was disabled again.
So I downloaded the most recent firware and used the upload option to install it. I then did the reset via the pinhole button on the rear and boom!
Power LED comes on but no-one is home any more. The damn thing has trashed itself internally. In this location I had a spare and replaced it straight away which gets the site back on the internet, etc. But what pain that is when a simple firmware update blows up the modem.
So why was it not saving the DMZ. Guess I’ll never know.