Thanks @Captain, I'm very grateful for this
If they will consider the update, Qviart Lunix 4K will join Edision OS Mio+ 4K in terms of DX capabilities and besides, because thet seemingly missed also 1.8.28971, overall improvements in stability and performance in low signal environments shall be visible

I tried to check which firmware version is currently a part of bcmlinuxdvb.ko, but despite a clear visibility of firmwares inside, I could not match any of available versions starting from v1.8.27495 from March 2020, surely something older than April 2021