PR4100 lost volumen

After upgrade to OS 5 my PR4100 lost second volume (Raid 1).
How to back? any idea?
first one working well. Second disapear, but both HDD is visible and good condition.


@Chris_PL : can you please private message me your system logs?

Sure, how to send to you?

sent you a private message

It is sent

Thank you WD support team for fix my problem.
the topic can be close.