Yes, if you want to go from the OpenPLi 4.0 to OpenPLi 6.x++ on your DM800HDpvr (with Japhar Sim), you will need to download the NFI file and flash it into the box.

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/