I have no access to my cloud after the update.
I did also the factory reset and nothing changed, I tried with two different router also both with factory setting.
I have access to the my local lan. If I try to do the cloud access the message that I get is “internet connection problem”, but is not, I verified that with the WD support, I receive regular report email from my system, so, if I try to reset the password in the cloud, I’m redirect to the os5.mycloud.com and if I type a new password the website said that the link is expired… it’s not.
I spent weeks with the italian WD support but they ended with the answer to wait a new firmware upgrade because my machine is not working for unknow reason… 
my ex4100 is totally useless after the upgrade right now.
This is sounding disturbingly similar to what’s happened with my NAS.
I try many things, and after trying to downgrade the firmware I ended damaging the unit in the process for the loading firmware. I don’t have it anymore and I really don’t miss it.
