The problem is I can't get the box to enter Flash mode. The usual of pressing the standby button while power up just doesn't work.
For a very brief moment the display changes from boot and then back to boot.
Looking around some of the forums it appears to be a known problem with the H7s. It would appear there is a problem with the underlying firmware not correctly interpreting the button sequence.
So far as I know that isn't another way of forcing the boot process to go to flash, unless anyone knows any different