Fixing audio with AppleALC

Hi all,

I was successful install MacOS Big Sur via OpenCore and I mounted EFI file to start Big Sur without USB. I suddenly found my audio is not working, I studied a lot and I knew that I had to change layout-id ( alcid=xxx ) in config.plist file. But I dont know where the config.plist is? (dont know where is EFI folder)

Please help me how to find the config.plist file and which tool to edit this file.

Thanks a lot.