DGX-1, How to reinstall the os system?

Previously, due to the need of the project, it was moved into the special security area for use, but after it came out, the disk was emptied and the system was no longer available.
So I would like to ask how to re-install the system?

https://docs.nvidia.com/dgx/dgx1-user-guide/maintenance.html#restoring-the-software-image