How to Exit Factory Mode for Samsung Galaxy Devices

Steps :
1. Download "ES File Explorer" or "Root Explorer" app
2. Open " Root Explorer" and navigate to : efs/FactoryApp/

3. Open "factorymode" file with text editor

4. Change it from 

OFF

to 

ON

5. Save and exit then Reboot your device
If it doesn't work, do the same steps for "keystr" file
You can also exit this mode by using another method

Steps :
1. Download "Terminal Emulator" app
2. Open "Terminal Emulator" and type 

Su

Then enter
3. Type

rm /efs/FactoryApp/keystr
rm /efs/FactoryApp/factorymode
echo -n ON >> /efs/FactoryApp/keystr
echo -n ON >> /efs/FactoryApp/factorymode
chown 1000.1000 /efs/FactoryApp/keystr
chown 1000.1000 /efs/FactoryApp/factorymode
chmod 0744 /efs/FactoryApp/keystr
chmod 0744 /efs/FactoryApp/factorymode
reboot

Then enter ... your device will reboot

Downloads :
"ES File Explorer" app HERE
"Root Explorer" app HERE or 4Shared for free
"Terminal Emulator" app HERE
from: http://truefirmware.blogspot.com/2017/01/how-to-exit-factory-mode-for-samsung.html