Hello in case someone uses this information.
Yesterday I installed big asur on Noteboock 15 HP and after many unsuccessful attempts I decided to change the boot arguments to these. -V kext-dev-mode = 1 dart = 0 nv_disable = 1 -cdfon -igfxnohdmi alcid = 3. With this I now have Catalina 10.15.6 and Big Sur boot