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 button is released. Then it boots up and loads the /nvram/startup.txt and configures the root password and system settings...
Am I doing something wrong? Any other way to hard reset this?
Jim Harbin
Systems Engineer
Hagerty Insurance
Traverse City, MI