Re: identification of ? decoder
There is a DCC company called CVP products, (cvpusa.com) You might want to contact CVP.
But before you do, the easy thing to try is resetting the decoder. Put the loco on a programming track and set CV8=8. If this works, the locomotive will now be on address 3. Then you will be able to set it up. Note, some systems like NCE, act differently if you enter a leading zero or not. So if in doubt, try it without and then with a leading zero.
If that fails, contact CVP.
Wiring for DCC