For the life of me, I can’t find that knowledge-base document. If you know the direct URL to the article, can you share this with the community?
Here we go:
http://support.wdc.com/KnowledgeBase/answer.aspx?ID=10433
Second Appearance of Important sign 
Thanks. Now, is there a KB for the EX2100, EX4100, DL2100 and DL4100?
That’s what I can’t find.
Nope, not in detail. As this reset proceudre is bound to the operating system, it’s valid for all models / series.
Ok. I don’t have a blank NAS to try this on.
Anyone on here who has a NAS where the UI has failed who wish to try this procedure?
I am trying right now! Will come back to you asap 
Update: the described reset procedure worked fine! 
Now I have firmware 2.10.302 - I’m not quite sure if I should try the update again 
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Excellent!
I have same trouble.
I just bought dl2100 yesterday, for the first set up is normal, but when i am updating the firmware, i cant reach http:/wdmycloudDl2100 for setting & also cant reach data on network.
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Yeah, it’s a joke that WD is doing nothing about it!
