See this topic,

http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=16897

You can fix the box only using the DreamUp software or JapharFlasher, with a RJ45 cable from Box to Router/Modem, and a USB cable from service mini-usb port of the Box to the PC USB port. See the Tutorial about NO CA ERROR below,

NO CA Error : http://www.ourdreambox.com/ubbthreads.php?ubb=showflat&Number=15214#Post15214

You can then use images only from the link below, as your box is an Original DM800HDse V2 box.

Original Images : http://www.ourdreambox.com/ubbthreads.php?ubb=postlist&Board=171&page=1

TS
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DM8000, DM800se, DM500HD, DM800HD, DM7025, DM7020s, DM7000, DM500s
VU+ Solo, VU+ Uno, VU+ Duo, Kathrein UFS910
Tivusat, TNTSat, Fransat, SSR/TSR, BBC1-2-3/ITV
DE-OpenBlackHole 1.4 image : http://www.openblackhole.com/