Custom Resolution Utility (CRU)

[CokeMania]

I have my new MB asrock H510M-ITX, it supports 5.1 and 7.1 sound output. Since my monitor only has stereo output and my home theatre only allows optical input, I purchase a HDMI adapter to convert the HDMI signal to HDMI and optical, while the output HDMI to monitor and optical to the home theatre. PC shown the only selection of stereo and 5.1 or 7.1 cannot choose.

I tried the CRU to setup the audio output (6 speaker - 5.1 & 8 speaker - 7.1) to edit the EDID. While I tried to restart after the setting, the speaker setup in Windows turn UNKNOWN and no sound at all.

Any one can help on this? Thanks in advance.