HELLO,,
First how do i know what is my software version?
and how to update it step by step please,
and from where ill bring the updated software..
how to bring back the channels and setting i had before the update back,,,
thanks ,,
Regards... 
HOW TO UPDATE MY DM800 STEP BY STEP PLEASE.....??
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How to flash using LAN and internet browser: http://www.dream-multimedia-tv…flashing-firmware-browser
How to flash using 0-modem (and LAN): http://www.dream-multimedia-tv.de/en/dm800-flashing-dreamupTo backup your channels you can use different tools around. I'm not sure what's OK to talk about here but if you use your friend google you should find several possibilities.
The running SW version I guess you can see under Info from the main menu?