Tacx vortex firmware update stick at entering bootloader

I would like to update the frimware on my vortex which would be about 2 - 3 years old.

I have an android tablet and using the training app or the old utility app it gets stuck right at the beginning. I even went to the trouble of removing the garmin app and unpairing every single bluetooth item which will take me a bit of work to reinstall. 

It gets stuck at "entering the bootloader" and nothing seems to happen. The light on the trainer turns off when "entering the bootloader" and does not turn on.

Has anybody managed to fix this problem.