Create ZOS USB

Go to node installer (see in dashboard there is a link) but for your reference https://bootstrap.grid.tf/

fill in your farm id, in my case 3456

select main network

select the top one: USB image

It will now prepare this USB image and download.

Use the Balena etcher tool again to burn this USB image to USB

select the downloaded image and put on USB stick.

Once done boot the 3node (your computer) with this USB stick.