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Just completed this procedure on my EX2 Ultra.
Worked a treat.
Thank you very much for this guide
Anyone try this with an EX4100? Having so many issues with 5 I would really like to give this a try but don’t want to brick my NAS.
My Cloud EX2 Ultra success back to OS3 
Than you for your manual! 
I would stay with the old OS3. WD said the OS5 is an upgrade. However, so far from what I see, it even has less features than the OS3 
Maybe you have to delete the old wd-device (with the static ip) in your router.
done that, thanks, but when I turn the NAS back on, it keeps telling:
IP address: disconnected
Without wanting to sound arrogant, it does truly sound like a networking problem
Quick ideas:
- Try with another router
- I cant remember if the Mac address is printed on the device, if so that’s another possible route in
Where are you seeing “Firmware update failed”? Is it on the LCD?
Are the network lights on the EX4100’s LAN port working?
I presume you did the obvious step of powering down (rebooting) the router and all other devices attached to the network. . . .
You could also try the 4 second and 40 second rests on the EX4100. You might get lucky.
When I can’t find a devices on a local network when helping people.
I use an Apple IOS app to net scan it is called Net analyzer in the Apple store.
I am sure there are same types for other phones or windows store for PC’s
I use fixed IP BUT as said NAS updates can change that.
( I hope that is the only problem and you get this solved )
Other steps are direct computer to NAS which is a good fall back on network problems.
The free light versions of the net tools should be ok just to see the IP address and device name.
Yes, MAC address is printed on the case, but how would it be of some use?
@Cordorb: Tried connecting NAS straight to PC, but it isn’t detected either
Yes.
If the lights are blinking on both the EX4100 and the router. . .then I think it is a fair assumption that they are talking to each other. There should be two lights. . . .solid means it is connected; blinking means connected and actively talking.
I honestly would not expect communication to work if you plug the NAS into a PC; unless the PC is configured to be a DHCP server. . . .which I don’t think I have ever looked into (that’s the router’s job)
So 4 and 40 second resets are used to “reset” the device and clear passwords and configuration.
There is a physical button somewhere on the device that allows you to do a 4 or 40 second reset if you hold it while powering on the device. A summary of the impacts are here: (This article applies if you trigger these resets from the device dashboard. . .but you get the gist. . .I couldn’t quickly find instructions for a power on reset.
How to restore a My Cloud EX4100 device to factory default settings (wd.com)
I suspect that there may be a glitch where the NAS is trying to use an IP address in a different subnet than the PC and/or router. . and that is causing an issue. (same subnet. . .first three sets of numbers in the ip address are the same: ex: 192.168.0.xxx). The resets should wipe out settings related to static IP address in the nas and “allow” the router to assign an IP address to the NAS.
Maybe I should ask “What do you mean it doesn’t appear on the network?”. How are you looking for it? I would start by looking for the NAS units IP address in the router dashboard. I would then use that IP address for SSH into the unit or to access the NAS dashboard from a web browser (it won’t be the normal OS/3 or OS/5 dashboard if the device is in a “recovery” state (i.e. running on the Rev 1.0 recovery firmware). I would not expect typing the device name in the web browser address bar to necessarily work. . . I would type the explicit IP address you get from the router’s dashboard.
Thanks, used this procedure for my My Cloud Ex2 Ultra, worked like a charm! I only use this NAS locally and don’t like to make it dependent of Internet access. Already thought I had to put it in the bin and buy a real NAS instead. You really saved me some money!
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THANK YOU, IT WORKS FOR ME!!!
But one addition:
If you have encrypting a RAID volume on a WD My Cloud Device, you have to add your password.
After this the old shares are available 
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It worked fine for Mycloudex2Ultra!
Awesome post! 
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So, I need to disable the static IP before running the commands, right?
Thanks for the lesson, but up there I still can make it.
THANK YOU, IT WORKED!
Didn’t changed anything about the static ip as it was configured on my router and not on the nas.
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then please stop replying: your answers are of no use to me. thanks
