Sorry..! TS You have make a BIG misstake if you not write down the old settings becaues its only on sparepart driver you have a label to adjust according to servicemanual , the original is without label (and not adjustable according to servicemanual because of unknown value) you have to use use a microphone and some audioanalyzer and tonegenerator in a quiet room like b&o do in factory
from ebay? If you get a used dve you can change it by your self, but it have a different serialnumber then, thats doesnt matter if pincode is known or disabled