My Cloud will not set a Safepoint, WD says can't tell me why due to confidential nature of issue?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
6

This method seems to have been successful for many.

http://community.wd.com/t5/WD-My-Cloud/Easy-method-to-downgrade-to-previous-version-of-the-firmware/m-p/773073/highlight/true#M18956