To repair any mobile at first need what kinds of mobile it is. What kind of problem it is. During the time what event occurs. China mobile set having some problem about its quality. But some products are so much attractive and strong. Sometimes mobile hanged and sometime mobile software is not working. In this situation need to flash mobile. There are many kinds of flash software in mobile media.
Jaff software, RH versions are available for nokia, samsung, symphony and other china set. Nokia N series, Samsung galaxy series are so much effective for internet and android apps. Problem may occur for touch screen and software, but device problem are not appear many times. In nokia set if any problem occurs of your mobile set or application just try first time for restore factory setting.
To do it need to give password 1234 in Nokia and samsung mobile. But in all china set the password is 1122. It will be so much helpful for you to solve any complex problem of your mobile device of any company.