After hard update the Raid 1 hdd shown as empty

Okay, I'll try to go back to OMV 2 and let you know what will happen then. I think it will be the best way to test it in an VM to find out which of the Debian mirrors still active.

Today I got no spare time to do it but I'll try it as soon as possible.

Back on version 2.x and thanks to erik for the suggestion of the chinese mirror. I was running a little bit an earlier version of OMV 2, because it looks a little diffent than my former OMV but it's okay.

No data were found on the raid (screenshot) and the drives were shown as empty.

I'm stuck again right now.

I think you're right but you also told me what I don't want to have heared.