Recover Lacie 5big network v2

Hello,
I request your help please to recover a Lacie 5big network v2, I want to use and has all new disks but when you start the device this does not load the firmware and LaCie Network Assistant does not recognize, I think the firmware is installed on disks, because I have another functional unit and when you put the disks 5big network 2 that is not working LaCie Network Assistant recognizes and I can enter the dashboard.
I appreciate that you please share me the picture raid of this device and the most stable firmware, and the software I use.
I request your help please to recover a Lacie 5big network v2, I want to use and has all new disks but when you start the device this does not load the firmware and LaCie Network Assistant does not recognize, I think the firmware is installed on disks, because I have another functional unit and when you put the disks 5big network 2 that is not working LaCie Network Assistant recognizes and I can enter the dashboard.
I appreciate that you please share me the picture raid of this device and the most stable firmware, and the software I use.