It will work if you have the File that installed the data onto the Flash Board. The concept was that gigging musicians could take their Flash Board and their File... when they travel. They put the board into the rental unit, and once they load the File it is exactly like playing the unit they left safely at home.

Without that File, however, it’s just data on a board with no way to access it. Hopefully, the data currently loaded in the unit is the data that unlocks the installed Waveform List. There is a possibility that other Voice data (a bank that does not utilize the installed Waveforms) is currently loaded. If this is the case, you’ll want to locate the original File that installed the Waveforms.