Harman /Becker AMP

could some one shed same light on the following questions before I proceed….
I have included a snap shot of my amp for reference.
- will a used AMP need reflashing from the dealer or should it work if the model # is the same
- What does the LU and HW numbers represent .
- should I stay with the 9065 model.....I have seen some 906 but the last digit fluctuate . I.E 9065, 9068 and so on.


