Right after "Welcome to Kindle!" there is a login:, hard to see because of status messages. You have a very short amount of time to type "root" <enter> and then it will ask for your password. You can type that quickly, and then paste a clipboard full of commands that you already copied from a script.
The minimum you need to do is "touch /mnt/us/ENABLE_DIAGS". Then it should reboot to diagnostics mode, where there is more that can be done. On a k4, you can export an SSH shell. On a touch, you can either run /mnt/us/runme.sh or push a reverse shell using netcat (nc).
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