Mike Pel

Hi everyone I need help!! I have running for nearly 3 years a Floureon cctv with 4 cameras on a 8 chanel nvr. I recently bought 2 more cameras (same brand and model as the other 4) but I can't connect them. When wired they work but I can't make them work wireless. It shows "already added" after running "a match code" but still not working wireless