I have tried the same thing and it bricked mine… I could access the content by mounting it directly(by opening it). I had backup so I could restore from scratch.
I WILL NOT REPEAT this mistake. Need to have the same version and trus that the version that will be downloaded is the same. In my case I think that the source of mini-dlna changed…
I used this to restore
http://community.wd.com/t5/WD-My-Cloud/GUIDE-How-To-Unbrick-your-2TB-3TB-4TB-My-Cloud/td-p/765959
