The META-INF directory stores signature information. When compiling and generating a package, a verification calculation will be performed on all files to be packaged, and the calculation results will be placed in the META-INF directory.

The data in this folder is checked and used when installing the flash package, and will not be stored in the phone after installation. For example, if you modify something in the flash package without authorization, an error will occur during the inspection during installation; if you flash it with the original package first and then use the re manager to replace the things, the system will not report an error because it will not be checked again, but Some software is incompatible and cannot be used after replacement. In this case, the system will report an error.