Roland SPD-S Advice Needed


I have a SPD-S here in front of me. It belongs to a band which has recently recorded some material in my studio and now they want to take some of it on the road.
They have never used the machine much and have never made any presets they want to keep. They would very much like to reset memory to "factory". After reading the manual I am in doubt whether choosing the "all" setting that includes the waveforms as well as anything else will erase everything so the machine is completely empty including the waveforms that comes with the machine.
So my question is: How do I reset it so it is exactly as it was when it came out of the factory with the same amount of memory as at that point.

All the Best