If you are still showing WiFi connected in battery usage, use the following steps
CONNECTIONS - WiFi
ADVANCED OPTIONS -
1. Uncheck 'Scanning Always Available'
2. Keep WiFi on....... - Check 'only when plugged in'
Enjoy longer battery life........
even i went back from marshmallow concept rom to D6653_23.0.A.2.93_Customized_20IN and tried to root using giefroot.. but getting stuck at
Invalid APK file: exploitServiceApp.apk error..
i doublechecked the device to be in flight mode.. and mo...
Go into app drawer and then left soft key - bring up edit option - then drag and drop your wanted icons into the dock bar - back hey twice and hey presto icons on home screen.