I tried firmware update 1.07.18 from the network it failed several times. Gave a message about the download failing.
I downloaded it and put it onto a thumb drive - it started the firmware upgrade and it sat at 0%. I waited for about 30 minutes and it still sat at 0%.
I then decided that since it had not started it would be OK to pull out the power (despite all dire warnings) and restart it. I then had a brick!
A message on the WD said to insert a USB drive containing the firmware - I did that (put the usb key into the front USB port) and the firmware update screen came on - it still sat at 0%. Arrrgh!
I tried several versions of the software and the firmware was not recognised as an ‘upgrade’ so would not start. Read a bit more and it was suggested you put the (new) upgrade files only onto a usb key (formatted to FAT32) and put it into the rear USB slot.
It worked! Oh boy - relief. It’s all good again.
In future if the upgrade from the network fails, just let it go. It’s better to have out of date firmware than a brick with a blue light on it.
A bad experience which I thought I would share - it might help other people in my position.