so I only have one last thing for you… since you have access to the WebUI interface in a way this is a good sign; it means that the linux within your device has booted up and is running. The bad news is that something is preventing it from mounting your drive.
Try checking and updating your firmware again. if you get a message that your firmware is up to date, try downloading it manually using this link http://www.wd.com/wdproducts/updates/?family=wdfmycloud_s then updating it manually.
call WD tech support when all else fails…
Good luck
