How to hard reset in Huawei U8660 & U8661 Sonic

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Saturday June 15, 2013
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June 19, 2013
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Hello,
I tried to hard reset in my huawei U8660 & U8661 sonic but can't do this case . I press the button power, volume up & down key. So I see the black screen or pink screen by blank. So I can't hard reset the phone. How do I do.
Please answer me.

Thank you !!!!