Ublox Firmware Update 1.30 to 1.40

I have just purchased the Here+ RTK and have been following these instructions to get me going -

I got as far as uploading the base module firmware successfully -

Then I read there is a 1.40 for a moving base module which is exactly what I need, and this is where I ran into the problem.

I have followed the exact procedure as I did for 1.30 except using the 1.40 firmware -

The ublox firmware updater will not update when I hit the little green ‘GO’ button bottom left.
It seems to start, then 2 seconds later stops and when I check the firmware version, it is still 1.30

Has anybody experienced this?