BDM-010 and BDM-020 and BDM-030

How do I know if my PS5 controller is BDM 010 020 030 040?

For how do you know whether you are dealing with a BDM-010 or a BDM-020 controller model? You can see this on the back of the controller. If there is a small letter A in the middle of the top lines, you are dealing with a BDM-020, otherwise with a BDM-010.

BDM-030 BDM-040

For the 030 mod chip it will work on the BDM-040 there is bit of sticky rubber in the way seen in red in the picture the best thing i found rubbing finger over few time should peel off