My M3U to E2 converter is sadly offline, I need to fix php code. Meanwhile, you can check alternatives.
First alternative is Enigma-TV IPTV converter. You can download it here. You need to click on HDD picture on the bottom. Webroot didnt detect any malware with this package – I think you can install it safely. Here is small tutorial based on rapidiptv website.
Open the program and open your m3u list in the “M3U File Channels” tab. List should populate with channels in m3u file. If you do not see any channels than there is something wrong. If you see channels than just click on Generate Channel list! You should get message that channels file is generated. It won’t be generated in the same folder as your m3u file but elsewhere. Please check second picture for explanation where this file is located.
Open folder (check picture below) on your C: drive and you will find the file userbouquet.xxx.tv in it. Rename that file to userbouquet.favourites.tv
Third step is using DreamboxEdit. Download your existing channels list from satellite receiver in a folder and copy the file userbouquet.favourites.tv in it.
Close Dreambox EDIT and open it again, open the channel list you downloaded previously. You should see your IPTV list in bouquets selection. Upload the files to the receiver. You are done!
Second alternative are these converters (not my work): IPTV converter – 101 (1:0) and IPTV converter – 4097 (4097:0)
Just open HTML in your browser and copy/paste your m3u file into it. These convertors are basic but they might be helpful to you.