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I am using rooted Samsung J2 pro with Marshmallow 6.0.1. My mobile hotspot uses a lot of battery. And this battery usage is reported by Android OS process by Smart Manager.

I have reduced the tx_power manually from 4 to 1 in hostapd.conf located under /data/misc/wifi/hostapd.conf but it gets overwritten whenever I switch on the hotspot.

How can I make it permanent or is there a way to change tx_power through adb?

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