Enter *759# 83 1580 in standby mode to enter the engineering mode, select the option with url in the magic book, subtract an I from the mobi behind the URL and add it back. After saving, keep the right button to exit, and he will restart the memory himself and get back some files. It is best to use qpst to delete all files in the download folder, which can save space. This stupid thing sent by the school, I lost weight after deleting qq. Installing a ucweb often can't get online, so I think uc is more suitable for uc, and I can also buckle the pictures and ringtones I downloaded online, otherwise the whole school will be watching their mobile phones when a ringtone rings.