If i remember right then the NVRAM can be reset to factory defaults by pressing B-Trigger on front panel while powering up. The only thing that is not set then is the Ethernet MAC address. That’s because MAC must be unique for each unit.
As mentioned earlier, the MAC is stored in six bytes, and located at DS1728W address 0x6F0. The first three bytes must be 0x08, 0x00, 0x11, the next three you can pick randomly provided the same values are not used in the same network by other equipment.
You’ll need to run all the calibration utilities so that scope inputs DC offsets etc are good again.