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The Head of POCOPHONE has mentioned that the fix for echo issue was included on 10.3.5.0 Stable Beta. Those who had echo issue on 10.3.4.0 stable, please try 10.3.5.0 stable when it releases to all users (expected to be released in few days) and see whether the echo issue is fixed or not.
Please refer this thread for more information about 10.3.5.0 Stable Beta. https://c.mi.com/thread-2234514-1-0.html
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