It involves imaging the new USB with the image of boot code for the NimbleOS version to match your active node. I am not sure what the process is for getting a copy of that after you are off support. You can try to call Nimble support, they will tell you what they can do for free vs what requires Time & Materials.
Typically that imaging is done from a laptop/workstation, then then drive replaced in the node.
_________________ Richard Siemers The views and opinions expressed are my own and do not necessarily reflect those of my employer.
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