Solutions to several programs with error prompts during installation: (Beginners must see) Error Prompt 1: Certificate Expiration Description: Software certificate expired. Solution 1: Adjust the mobile phone time to the certificate time limit (adjust the mobile phone time several months in advance) and then install it. After installation, adjust it back to the correct time 2: Re-sign the software. Error prompt 2: Certificate error description: 1. The installed software is unsigned 2. (Many java games will give this error prompt. See the following 2) Solution: 1. Sign the software; 2. Install the program (software/game) directly to the mobile phone or replace the memory card. Error prompt 3. Description of update error problem: This prompt usually appears because the old version of the same software was not deleted in the mobile phone when the software was installed, and the installation was repeated. Or conflicts caused by different titles of old and new software installers. Solution: 1. Install the new version of software after uninstalling the old version; 2. Unpack the new version of the software and change the title of the installer to be consistent with the old version in the PKG document. Error Tip 4: The certificate is not yet valid. Note: The mobile phone time exceeds the time limit of the software certificate. Solution: 1. Check whether the date setting of the mobile phone is correct; 2. Adjust the time of the mobile phone to the time limit of the certificate and then install it. After installation, you can call back to the correct time. Error 5: The required program access rights have not been granted. Description: 1. Due to the security problem of the third edition of Saipan system, the permissions of some programs are banned. A program without this permission cannot be installed, or the program has been signed. 2. Error in the certificate. Solution: 1. Re-sign with unsigned software before installation; 2. Remove the restrictions of mobile phone certificate authority -XX mobile phone error prompt 6: certificate is limited. Description: 1: It is caused by wrong software signature or multiple software signatures. 2. The certificate with low authority is signed for the program with high authority. Solution: 1: Re-sign with unsigned software before installation. 2. The certificate authority required by the verification program, which should be consistent with the program authority. (At present, the certificate authority generated by this forum is 17, and this problem may occur when signing a program with 19 authority. )