The box will reboot at least 3 times, while programming the sim card, so you need to let it go. It could take up to 10 minutes to do the job. Generally it takes 3-4 minutes.

The box when all wil be done will reboot and the boot will go properly with the correct boot screen of the image.

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/