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How to Exit Factory Mode for Samsung Galaxy Devices
If your device display a annoying transparency black background which contains some info about your device (PDA, Phone, CSC, H/W, Camera, …)
in yellow text … and lock screen is not working, mean that your device is in factory mode.

“Factory Mode” is enabled if the EFS partition is corrupted because of installing custom ROMs, bad Mods or downgrading your current system version or after you succeeded in fixing the EFS partition.

• To Fix this problem it require knowledge
• Rooted Samsung device
• Root file explorer Root Explorer

Steps :

Go to Local
 / Device >
         efs >
        FactoryApp
and open factorymode as text in “ES Note Editor”
Change it from OFF to ON and save it
Open keystr as text in “ES Note Editor”, change it from OFF to ON and save it
Reboot.

Method 2 
Install “Terminal Emulator“

Type :
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

Method 3
WITHOUT ROOT

You can also exit factory mode and remove the annoying message without root, but it won’t fix it :
Go to Settings>
 Application manager >
All>
Search Factory Test
and “Clear data”, “Clear cache”