I have dm500s I faced problem of tuning channels. I was getting only one sat through switch. Finally I removed all the sat cable from Desicq switch and only one cable I connected on A port of Desiq switch. I got the Channels easily. I am still trying to find out the problem because I am receiving all the channel through this Desiq switch on Humax but when I connect the dm the problem were there. If any one have the solution please share