The Viark Sat 4K lost the ability to decrypt powervu in software version 1.04 and above.
I have seen a claim allegedly by Goosat (the receiver manufactures) which says they hope to fix powervu, bis etc soon. No idea if that is genuine or how soon is soon.
Strangely, other Viark receivers continue to decrypt powervu (my Viark Droi does), but not auto Biss.