first of all: I am surprised you could not get the sequencer working, because if you use it like the original sequencer it should already work. What exactly did not work? can you be more specific?
The noise after firmware reset puzzles me even more: Does it only play the noise now, or do you also hear the waveforms?
I am also wondering if switched on tested this after they installed it? Maybe you can talk to them if they had any issues? Never heard anything remotely like this before.
What you could try to do, just because it *might* help: Perform a firmware update to the newest version: