When I power up my mobile it freezes at the start logo
SOURCE: my samsung sgh-i780 has frozen and no service on
1. Power off the phone
2. Hold down the begin call and end call buttons (green & red)
3. Press and hold the power button
4. Once the phone's status LED turns red, "RELEASE" the power button but
KEEP the other 2 pushed. Very important to do this !!!!!
5. You will get a prompt to press the space key to format, or any other key to continue
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