No sound on my Windows 10 after installed by Bootcamp

Mid 2012 MBP 13" i used a USB3 flash drive to create the installer, and partitioned by bootcamp. After reboot, message - No bootable device available shows up. so i hold ALT and enter the EFI boot to start the installation. Then the GPT format issue shows up, and i solved it by deleted the partition in disk utility and added a new exFAT partition and formatted during the installation, i successfully installed the windows 10 but no sound available after all driver has been installed. I realized that UEFI might the reason why i don't have sound. i have no idea how to fix the problem now. please help. i am willing reinstall the system if needed.

thanks in advance