Jetson Xavier AGX full factory reset

I have a number of Xavier AGX’s all of unknown state (meaning I don’t know the usernames, passwords, IP Address, configurations, etc.)

I’ve been trying to rebuild them using SDKManager but that requires a username and password.

Googling seems to bring back a lot of strategies where you need shell access.

So my basic question is what’s the simplest way to nuke and rebuild these things to the state that it would arrive in if I bought it off the shelf today?