So I did copy the Config folder from the backup and then I was able to boot and access the array over the network. So progress here, but somehow the disk configuration got confused and and decided Disk1 of the array was the wrong disk (it wasn't). However I just started the array anyway and the disk is being rebuilt.
I would still like to change the ipaddress of the array back to what s was before the upgrade but I will wait on that because at least the upgrade is completed and the array is working.
Is there anybody who knows the proper way to change the ipaddress correctly without losing network access, I would be grateful for the info.
this would save me the effort of adding port forwards, etc. to the router for the new address and also save me from having to change all of the Wireguard settings for VPN access.
In any case, thank you JorgeB for your assistance here.