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"Factory Mode" is enabled if the EFS partition of your device is corrupted.
Sometimes if you succeeded in fixing the EFS partition, you stuck in factorymode.
If you see a annoying transparency black box which contains some info about your device (PDA, CSC, H/W, TSP, TSK ...) in yellow characters ... mean you are in factory mode.

Your device must be rooted to exit this mode.

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
to
5. Save and exit then Reboot your device
If it doesnt 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
Then enter
3. Type
Then enter ... your device will reboot

Downloads :
"ES File Explorer" app HERE
"Root Explorer" app HERE
"Terminal Emulator" app HERE