You should talk to the vendor of the board - maybe they have a way to check for faulty wiring ? Looking at the documentation for the board, it looks like it's using GPIONext and that should detect any GPIO inputs easily.
you know what i did. i just did a fresh install - retropie 4.6 image. thanks for all the info and help, but a fresh install isnt that hard, it takes a couple of hours and then everything is working fine. also, the time and effort needed to upgrade the whole lot with all side complications possible - and having to resolve them -, that would perhaps take longer than just simply imaging the whole sd card to a disk image (.img) then flash it with retropie 4.6 and then mount the .img and return the whole lot to its folders.
Ok, half a day later, I realize one (perhaps small) problem concerning the Pi4 project. As I am going to build two Arcade Machines together with a friend of mine, I had to setup RetroPie twice. One on a Pi3b+ and one on my Pi4. Testing with the old "Hyper Sports" on mame2003, I realize a perfect behavior on the 3b+ but a small delay on the Pi4. So pushing the button and taking effect differences a little bit (made me miss the skeets on skeet-shooting ;-) ). Do you have any idea why this is and - much more important for me - how to solve this problem?
@demonscythe hey, i have 2 m30 controllers and work great with raspberry pi.
how are you setting up your controls in emulationstation, and which games are you playing. I had this issue
Ok by default sega genesis will be funny like X will be A and A will be B and B will be C, but lets start with emulation station, i mapped my keys with b is a and a is b.
When mapping set B on controller as A and switch them X is y and Y is X
Z is L shoulder and C is R shoulder
L trigger is top L and R is top right.
Also make sure you are pairing with Switch mode.
Start+Y then press pair and reboot your raspberry pi.
Hope this helps
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After finished there are some errors in libraries that made crash emulationstation but they are easy to solve. Once it runs very well including with overclocking. With this fan “Noctua Premium Fan, Brown, NF-A4X10-FLX 5V” I could overclock and no problems.