Ok....disregard my last message...let me give some clarification here...
Press and hold the Display Menu button, not the reset button as the system starts up and you will get the boot menu...then do an 'NVRAM init' ...
I also have acquired a used P550. I have physical access to this box and need to reset the system back to the defaults and the root password. I tried the suggestion of holding down the reset button on the supervisor module while powering on, but the switch then will not boot until the reset...
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