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Regarding your question, I’ve never tried this and I haven’t seen any similar case in the Community, so I can’t tell you for sure if it works or not. You could try to interrupt the boot sequence at start up and check if the USB partition is available as a part of boot options (honestly, I believe this is not the case but you could give it a try). You’ll need to be connected through serial to check the boot process and to be able to stop it.