I tried to reset the system twice.
First time: After reset, the speakers had worked properly for a while until the synapse3 updated. The option for Speaker(Realtek Audio) disappeared again.
Second time: After reset, I have disabled the automatic-update-option for the synapse3. The speakers are working properly; however, the current version of synapse3 cannot detect my Nari ultimate headphone. If I want to set my headphone, I have to update the synapse3 but if the synapse3 updated, the speakers will not work.
Could anyone give me some advice? Any response would be appreciated.