Hold the power button + home button at same time to go at recovery mode
Here you will find every games that you want for android and
iOS for free : http://technologygamess.blogspot.com/
How to unroot:
It's the same process as root process ,but you need different file.
Unroot file: http://adf.ly/JjuRM
Don't try this on galaxy mini plus s5570i,because you can brick your phone.
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