I did all mine with echanlizer had to load the m3u file on to my Gemma first use m2b it's in the plugin section. Once the m3u was on the box and the channels are working read the box from echanlizer then just replace the channels from the m3u my list with the dark ones..
You will have to do each channel twice one I whichever bouquite and then one in the all channels ones.
Assuming you have it already set up with your box,
Open EChannelizer and "Read From STB", select the bouquet with the dead channels.
Select on the channel which you want to replace, right click and press the trash button which will remove it.
Right click again, and press the @ button which is to add a stream, enter the channel name, stream URL, and other info. It's also worth adding the stream reference by selling "none", choosing the satellite, and finally the channel name. This will apply the EPG from satellite to the channel
This could mess with th channel numbers, not too sure.
Also ABM will overright your bouquets that IT MADE.