New member in need of help on 2012 Honda es

It says it’s in first gear but it’s in neutral. You can roll the roller, we’ve tried rocking it. Cleaning all the connectors out. It did it to our friend and he cleaned mud out of two of them and it ran fine. Then when we rode it. My dad tried to put it in reverse and it got stuck in neutral. We’ve looked up the codes and tried everything. Please help me