Lacie 5BIG vs2 back to Lacie Firmware from fvdw-sl 15.1

Hi to everybody,
first thanks to all this forum staff.
I had a 5BIG V2 died and I have get it alive with the installation of the fvdw-sl 15.1 firmware.
Now I would like back to the Lacie Original Firmware but.... HOW CAN I DO IT?
The problem is that I have 4 (3Tb disks).
I have tried load the firmware (LACIE CAPSULE) from the Control Panel in the 15.1 version but I get the error that the file is not the correct file.
Could anybody help to me...??
Sorry from my english... Regards from Spain.
first thanks to all this forum staff.
I had a 5BIG V2 died and I have get it alive with the installation of the fvdw-sl 15.1 firmware.
Now I would like back to the Lacie Original Firmware but.... HOW CAN I DO IT?
The problem is that I have 4 (3Tb disks).
I have tried load the firmware (LACIE CAPSULE) from the Control Panel in the 15.1 version but I get the error that the file is not the correct file.
Could anybody help to me...??
Sorry from my english... Regards from Spain.