Firmware V1.23A

[XORadmin]

I don't know. It is reported to work by other users. Maybe you got to enable 6 button mode with some special setup on the pad itself?

I dont think the gamepad is in 3 buttons mode because in this case x,y,z buttons should act like a,b,c in the games (and i dont think anyway this gamepad have different modes)
Now they are just doing absolutly nothing... 

On my gamepad pcb its writen "REV:A 2017/9/16" (in case somebody opened he's and can comfirm at least rev a near this date working...) 

Unfortunatly i dont have a game that use the six buttons buttons to try it on the megadrive , so i cannot be shure is it the gamepad the problem or not...

How possible it could be to be a hardware problem on my specific NerdSeq or adapter? Any easy (and safe) way i could test this by switching two diferent pins on the controller or something like this? 

its very frustrating and now i dont know if i should get another controller, im affraid to have the same issue again...

Your NerdSEQ and Midi expander is fine. Else UP/DOWN/LEFT/RIGHT wouldn't work which use the same pin as XYZ and Mode.
Your gamepad doesn't react on the 6 button request. Why, I don't know. Could be that the gamepad doesn't react well. Could be a timing thing. Original Sega, 8BitDO and other user reported Retro-Bit work well.


Which retro-bit did you get exactly and where from? If i can get my hands on one, I can debug and see if i can get it running as well. (I assume you got the Sega Master System/Genesis one)

BTW, some of the controllers got shoulder buttons, but they have no extra function with any sega things, but can only be mapped for PC related controlling or to the regular buttons. Sega gamepads doesn't allow anything more than Start/ABC/XYZ and Mode. And they can stay in 3 or 6 button mode, depending on the way they are interfaced.