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I hope this message finds you well. I'm reaching out regarding an issue we've encountered with the product. It appears that there is no sound coming from the device when using it in the FB mode. This is affecting our user experience, and I'd like to understand what might be causing this problem. Could you provide any insights or possible solutions? Additionally, if there are specific troubleshooting steps we should follow to resolve this issue, please share them. Your assistance in this matter would be greatly appreciated, as we want to ensure the product functions as expected. Looking forward to your prompt response!