Seriosly?!?!? When i open first time the cart i did some photos to help me to close after clean so i can confirm that the two board were in that wrong position.If that's how the cart was when you opened it, no wonder why it wasn't working. The PROG and CHAR boards were swapped. When you open an AES/MVS cart, you'll either see the top of the PROG board or the bottom of the CHAR board. If you see the top of the CHAR board then the PCBs were swapped.
I don't have the cart because i return it. But i don't understand the buyer that said me that it works before he send me......
Thank for the support