Hey there sky_eagle,
If you have followed these instructions and still doesn’t work, I have no idea honestly.
Anyway, I also have to mention that I don’t plug the USB all the way deep into the USB socket (I suppose that it’s a factory USB fault or something) in order to get the HDD working. Maybe you can try that? Insert the USB leaving it outside 2-3 mm, or try other USB mother sockets.
Hope this helps