The security of Android phones requires that the software or the brush package should be signed. If you brush a rom package optimized by a third party or other great gods, it is best not to open signature verification.

Brush machine is a behavior of changing the operating system of mobile phone, which is equivalent to installing different versions of windows or computer reinstallation system on the computer, that is, brushing the operating system of mobile phone.

The purpose of the brush machine is mainly to solve the bugs in the old version of the software, such as slow response speed, low volume, short message template, crash, display brightness and so on.

Others are to enhance the functions of the original model, such as increasing digital zoom, photo frame type, image editing ability and so on. To improve the function of the mobile phone without changing its hardware. Under normal circumstances, KF (Customer Service) can brush for free, and the speed is very fast, but before brushing, you should back up your personal address book, photos and other important documents. If your mobile phone works normally, you don't need to brush it.