Please help fix RAID array

[16k_zx81]

Stupidly I swapped out CMOS battery without backing up BIOS and now the customer's RAID does not boot.

The board is a GA-965P-DQ6

I have set the SATA type to RAID and it looks like this:



In RAID settings it looks like this:



Gparted identifies it as a 900+GB volume + 4 phys. disks, but spits this out:



... which Im not sure is entirely accurate given the history.

To be clear, all that happened was CMOS/BIOS reset and now the machine does not read the array.

Not sure where to start as I have not messed around RAID it for years and have no idea where to start. Im worried about breaking it.

Instructions as though speaking to a 4 year old appreciated, as I am really out of my depth here.

..