Thank you very much.
The page you have referred me showed another page https://www.tonymacx86.com/threads/guide-general-framebuffer-patching-guide-hdmi-black-screen-problem.269149 where i got readymade code for frambuffer for my motherboard which worked instantly with UHD 630.
Thanks everyone for your precious time.
I have installed the latest clover v 1508 by replacing old EFI folder using explorer++ from windows 10. Now the system is booting without any problem.
Now the problems are:
The install disk (i tried to install 10.15.4 standalone update) is still shows...
Till 10.15.3 i have updated without any difficult.
But, for 10.15.4, i got stuck at installation.
I have the kext, and other required files as per attachment.
I have updated Lilu, Whatevergreen, AppleALC and Clover to 5107.
I have put SSDT-EC.aml in \EFI\CLOVER\ACPI\patched
Successfully updated Mojave to Catalina.
First updated Clover.
Then installed latest version of whatevergreen, lilu and applealc to /L/E (using kext beast) and EFI/Clover/Kext/Others.
Updated all kext in EFI/Clover/Kext/Others with new version.
Ran the Install Catalina.app from Applications.
I have successfully installed High Sierra in my newly build PC.
But, for enabling Intel UHD 630 iGPU graphics, I followed post Intel Frame buffer patching.
the hackingtool shows the recommended SMBIOS as MacBookPro 15,1.
But, i could not get serial number for the model. The Clover...