It is the new code on this unit by default.
The SP mode MUST be 6 digits even when changed.
That said, I know of several occasions where Reset, 107107, CLEAR (hold) has worked.
...But that doesn't explain why there is no interface tab once in system settings
I seem to remember a similar situation on a machine I was picking up for resale some time ago. I think that there was some sort of 3rd party management software installed on the unit that put extreme limitations on the system settings, and once I managed to uninstall it everything came back.
Also.....have you checked that Service mode lock isn't enabled? You will have to turn on admin authentication, and then log in just to display the tab in System settings ( that's assuming that those tabs are even available in its current state
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