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Sadly no feedback from your support. 

According to Tim Worthington (creator of NESRGB), it is likely that the cart is not compatible with the very stable and powerful 5V levels that the modded NES is providing, as the components in the cart seem to be 3.3V parts.

Please get in touch

Thanks

Sebastian

I have forwarded this message to our support, it is strange that you have no reply yet. The voltage definitely isn't a problem, there is a voltage level translation on the PCB to make the used parts compatible with the console hardware.