RND6000 Remove inactive volumes Disk 1,2,3,4,6

Hello,

I am requesting your assistance in my attempt to recover my data following a failure of one of my hard drives (slot 5) on my RNDP-6000 running under OS6.

1°)  I replaced my defective slot5 hard drive (4 to) with a smaller one (3 to) so as not to lose any data.

2°)  The reconstruction seemed to have worked because I still had access to all the data, but the drives remained greyed out.

3°) I replaced the drive again with an other 4 to hard drive.

4°) The NAS displays two volumes:

 - a 13 TB volume for drives 1, 2, 3, 4, and 6,

 - a 1 TB volume on drive 6.

The NAS requests the deletion of the volumes from inactive hard disks 1, 2, 3, 4, 6 (13 to volume) and disk 6 (1 to volume). 

5°) I deleted the 1 to partition from disk 6, thinking that it was causing problems with the volume reconstruction, but this did not change anything.

Is there a solution that will allow me to recover my original volume and start rebuilding without losing my data?

I found this article, which seems to be the solution to my problem, but I don't know enough about mdadm commands to adapt it to my problem.

ReadyNAS RN424 | Inactive Volume + RAID Issue | NETGEAR Communities

I hope one of you can help me. Thank you in advance for your help!