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Engineer mode/Factory mode
![GUIDE][MTK] Using Engineering mode to increase audio output | XDA Forums](https://xdaforums.com/proxy.php?image=http%3A%2F%2Fimg.tapatalk.com%2Fd%2F13%2F09%2F28%2Fe9y4a2yb.jpg&hash=e17ce666cd5a79ec26a5fa36582d7af0 "GUIDE][MTK] Using Engineering mode to increase audio output | XDA Forums")
GUIDE][MTK] Using Engineering mode to increase audio output | XDA Forums
