Hello and welcome to our web page here my name isXXXXX a Certified Volvo Car Expert Mechanic.I'm going to try today to answer your question.
you cant use that etm
and you cant use a used etm they have stored vin numbers from other car so when you install it creates other problems
i thought you would be able to have it reprogramed
you will pay volvo dealer to try to program around 200 euros you have 50% chance it will work most the time it will not program and you will loose 200 but if it works you ok
i work for volvo dealer msot the time it fails cant program them
best is get rebuilt pre programed from usa they cost around 700 us dollaras