Despite the fact there are many UNO clones on the market and many have been used successfully for DCC++, there can be issues. Recently over at the Model Railroad Hobbyist forum, one user started to dig into why his DCC++ setup was having problems. I’m linking part way into the conversation here but it shows what the issue is. So, if you’ve been having troubles, this might help. Nothing like using a genuine UNO to make sure you have no issues.