SHARP AR-M550N Printer - How do I reset to defaults? Default Login?

I have a Sharp AR-M550N printer that I cannot login to "Admin Mode" via the network. I either need to know how to reset to defaults or get the default login credentials.

Any help here is greatly appreciated!
Who is Participating?
defaults commonly used on Sharps are Administrator and admin, or admin and Sharp (note capital S)
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