Update:
Tony has provided more information about his problem. After doing the firmware updates the H Plus shuts down after pressing the start button.
There was a change in the way the H Plus starts. It now requires a longer press on the power button to turn it on. A short press will start it but then it shuts off. A press that is too long will do the same. You have to find the "sweet spot" when turning on the H Plus.
Tony, let us know what you find.