RuiZH

I am very appreciate your reply,I'll try it a few day later

get HPET from Maciasl No error,restart computer output no devices

I tried it ,no lucky

EFI.zip

thanks your reply,updated ethernet driver to latest,no work

about my machine: Mainboard: BIOS Star B250ET2 Enthernet: Realtek 8111 Sound card: Realtek 887 CPU:intel core i3-7100 Graphics: HD630 BootLoader: OpenCore 0.6.1 Today I upgraded my desktop computer from 10.13.6 to 10.15.6. After the completion, there is no network and sound. The sound card (rtl887) and network card (rtl8111) drivers use the latest version Did i upload efi folder?