Hey , thank you for reading my silly post.... I fixed that problem with enabling CSM and adding usbinjectall.kext. Reached the installation screen. My graphics card Intel hd 520 doesn't work and I have to use a monitor through HDMI port. Is there any way I can enable my iGPU. NOTE - have tried the dortania post and GPU patching but no luck. Is there any "INJECT INTEL" option in opencore so that I can enable it after installing big sur with the monitor. Please help