I have a pi 3B and retropie 3.6 and recently hooked up a Xin Mo usb controller with 16 buttons. I have all kinds of issues trying to get both player 1 and 2 working. I changed the cmdline.txt finally and now it reads to sets of controls but upon mapping the second player in emulation station the first player's mapping completely changes. I don't know what to do. I have tried everything. I retyped retroarch and added in input_player1 and input_player2... nothing seems to work. A kernel update was released but that was meant for the pi2 and just locked up my pi forcing me to reformat. ANY help would be appreciated. Thanks