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How to access MCU1 that has root?

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The shop I purchased my MS from has already rooted the MCU1...does that mean only they can get in though given I don't have the certificates?

If I did have the certificates, I'm very familiar with Linux, ssh, etc. I am unsure of how to connect to the MCU.

Do people locate the IP and ssh in over a direct wifi connection or is there an interface cable I need?