Firmware to Fix the Analog Line Echo Issue for S-Series V4


  • Product Model: S-Series V4, S20&S50

  • Firmware Required: 65.16.0.X



The user might have echo issue when using analog line to make calls.



Previously, we recommended some commands to adjust the chip register value on for S-Series V4 to debug the echo issue. It is a bit complex to operate.

Recently, we optimize the commands and make the debug process automatic as well as the echo cancellation algorithm to improve the voice quality.

And we offer a specific firmware which includes this optimization. Here is the download link:


We advise the user to upgrade the firmware when he meets the echo issue.



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