several solutions with error prompts when installing the program (novice must see) error prompt 1: certificate expiration problem description: software certificate expires. solution: 1: adjust the mobile phone time to the period of the certificate (adjust the mobile phone time forward for several months) and then install it. After the installation, adjust the correct time (method of adjusting the time: Settings-mobile phone settings-general-date and time-date) 2. Error prompt for re-signing the software 2. Explanation of certificate error problem: 1. The installed software is unsigned 2. If it is a JAR program, it is generally because the certificate is in conflict. (Many java games will give this error prompt. See the following 2) Solutions: 1. Sign the software; 2. Install the program (software/game) directly to the mobile phone or replace the memory card. Error prompt 3. Update error problem description: This prompt usually appears because the same software of the old version was not deleted in the mobile phone when installing the software and was repeatedly installed. Or conflict caused by different titles of the new and old software installers. Solution: 1. Install the new version of the software after uninstalling the old version; 2. Unpack the new version of the software, and change the title of the installation program to be consistent with the old version in the PKG document. Error Tip 4: The certificate has not yet taken effect. Description: The time of the mobile phone exceeds the time limit of the software certificate. Solution: 1. Check whether the date of the mobile phone is set correctly; 2. Adjust the time of the mobile phone to the time limit of the certificate, and then install it. After the installation, you can call back to the correct time. Error prompt 5: The required program access rights are not granted. Description: 1. Due to the security problem of the third edition of Saipan system, the rights of some programs are prohibited. No program without this permission can be installed, or the program has been signed. 2. Error in certificate. Solution: 1. Re-sign with unsigned software before installation; 2. Remove the limitation of mobile phone certificate authority-XX mobile phone error prompt 6: Description of certificate limitation problem: 1. It is caused by software signature error or software has been signed many times. 2. Low-authority certificate is signed by high-authority program solution: 1. Re-sign with unsigned software before installation. 2. Verify the certificate authority required by the program, and the certificate authority should match the program authority. (At present, there are 17 certificate permissions produced by this forum, and this problem may occur when signing programs with 19 permissions.) Error Tip 7: Protected applications provided by untrusted providers cannot be installed. Description: There are several possible causes of this problem: 1. Mobile phone settings. 2. Software is not signed or the signature is incorrect. 3. Certificate conflicts. Solution: 1. Enter "Program Management"-"Options"-"Settings" of the mobile phone. 2: Re-sign unsigned software before installation; 3. Install after the grid machine (please make a backup before the grid machine) Error Tip 8: File damage problem Description: The installation program file is damaged or incomplete, which may be caused by file damage when the program is downloaded or solved. Solution: Please make sure that the downloaded program file is good. It is recommended to download again (from other posts) or decompress the program and try again. Error prompt 9: No prompt. Description: After the program is installed, click its icon, but it can't run. This usually happens to JAR programs with Chinese file names. Solution: Delete the installed JAR program, change the file name of JAR program to full English, and then try again. Error Tip 1: Mobile phone startup failure Description: Generally, this problem occurs when the mobile phone is restarted after a program installation fails, which is partly caused by the failure of upgrading the machine. Solution: If a program installation fails, just take out the memory card and start the machine again. And delete the wrong program. If it appears after the upgrade of the mobile phone, then it will have to be retooled. It should be noted that some software that is booted and memory resident cannot be solved by formatting. Therefore, all these softwares need to be shut down or deleted before the soft grid. Error prompt 11: This application is only for development. Continuing installation may cause serious problems with your equipment. Description: This is a disclaimer of the software. Solution: Ignore it and continue to install it! Error Tip 12: The validity of the certificate cannot be checked online. Please check the settings. Description: Solution to the problem of mobile phone settings: Settings-mobile phone settings-applications-program management: Software installation-select "All", "Online certificate check"-select "Off". Why do you think the software installed on my mobile phone can't be opened? My mobile phone has been in good use! My mobile phone was bought in Long Yun mobile phone network, and it is original and brand new, with good quality and excellent quality! The price is low, yeah! It is very enjoyable to use! I've got the goods inspected by the exclusive store. It's really 1% original and brand-new. I suggest you buy a mobile phone from Long Yun Mobile Phone Wholesale Network.