SSL84J is compatible with all Japhar OS, so you dont need to replace it as in fact you will just replace it by the exact same SSL.

HDD format, depends of image, but generally it works without need to reformat.

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/