Combination instrument (DIM) defective

Hello together, after our instrument cluster (Volvo V70 II year 2002, 103KW, petrol) had failed again and again, I thought that the easiest (and cheapest) solution would be to exchange the part for a used one. First workshop: AI exchanged, no signal from the control unit, no solution in sight. Second workshop (Bosch): Everything checked – it must be the AI, but can only be “fished” by Volvo. Current statement Volvo: If the used part has not been reset, it can be in us I think this problem is known – maybe someone has an idea how to solve this problem? Thank you for your help! Greeting KoenigZucker