How to get the myCloud gen 2 into safe mode?

@stacks
If you find a way place it here. Did you read the information about updating?

*** This is a one-way update. Users will not be able to roll back to My Cloud OS 3 from My Cloud OS 5**

My Cloud OS 5 Limited Public Release Now Available for More My Cloud Devices! - My Cloud OS 5 Personal & Network Attached Storage / Announcements - WD Community