Important: The Fast boot option in Settings > Power must not be selected.
Press and hold the VOLUME DOWN button, and then press and hold the POWER button.
Wait for the screen with the three Android images to appear, and then release the POWER an...
I will pray for you and your dad the god is great he will be with you. I am sure you will get back all your happiest moment with your family
Please try a fullwipe if you haven't already.
In recovery format system, cache, data.
If I remember right.
Also delete all the files from your sdcard except your personal files like music, photos, and such.
Make sure every file that has a dot in ...