Ensure you copy your mg_cfg file elsewhere so you have a backup and try one below that was taken from a dm800se but for cable (dvb-c) rather that satellite.
It's worth a try and it doesn't help then go back to your backup one.
Banging my head against the wall trying to get Mgcamd to work for 2 hours and wondering why the feck it wasn't working as I've done it hundreds of times and then I seen this post, This file works a treat mate. roud: