1, first open the phone Settings page, click \"system\".
2, then select the \"About Phone\" option, find the version number and connect and click 5 times.
3, then use the charging cable to connect the phone to the device that needs reverse charging, and return to the desktop of the phone.
4, then pull down the screen, click \"View more\" option, then the page pop up USB connection, click \"reverse charging\" can be.