MTK Engineering Mode use

Hello, i have install the App on the Playstore to increase mic/speak volume and all went well. Following a guide i changed parameters, but what if now i uninstall the App? Are the going back to default settings? I am asking because seems that the battery usage increased. Thanks for any answer.

they should stay at what you’ve chosen, I think the app just works as a shortcut for the engineering mode


Thanks a lot!