I had you problem, just downgrade it to 3 version and wait for new FW
http://community.wd.com/t5/WD-My-Cloud/Easy-method-to-downgrade-to-previous-version-of-the-firmware/td-p/773073
I had you problem, just downgrade it to 3 version and wait for new FW
http://community.wd.com/t5/WD-My-Cloud/Easy-method-to-downgrade-to-previous-version-of-the-firmware/td-p/773073