You need to use the JapharFlasher v1.1, naturally setup properly to connect with both cables, the RJ45 from box to Router/Modem, and Mini-USB cable from box to your computer.

The Box/USB cable should be recognized, if it doesn't you need to install the drivers for the USB cable.

See : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=2012&page=2

Read the NO CA ERROR Tutorial (PDF) for DM800HDse boxes, see link : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=15214#Post15214
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