1. When installing the software, you are prompted "Update Error" and cannot install it. This means that the software has been installed on your mobile phone and must be deleted before installation.
2. When installing the software, you will be prompted "Certificate error, untrusted application", and you cannot install it. This means that the software can only be installed if it is signed, and the person who wants to sign can enter the signature area.
3. When installing the software, you will be prompted "Certificate expired" and cannot install it. At this time, you have to go into the "Settings" of your mobile phone and adjust the time of your mobile phone for several months before you can install it. 4. When installing the signed software, you will be prompted that the certificate is restricted and cannot be installed. This software may not be compatible with your mobile phone. More problems can make good use of the search function, and people who know how to search can actually solve many problems! , absolutely useful for everyone-teach you how to use the file manager that comes with your mobile phone, delete those invisible themes and programs that are not installed, and delete them uncleanly. Must be installed. Connect the computer with a mobile phone, pay attention to the data transmission mode, or use a card reader. Then, you can see private folders with hidden properties. Otherwise, the computer will set to display hidden files. Then set its property to not hide, that is, remove the hiding, so that you can search the contents of private folders with the manager that comes with your mobile phone. But I suggest using the computer to delete the theme or uninstall the program. The following is a detailed deletion method.
1. There are too many themes installed, which makes many themes invisible in program management and cannot be deleted. You must be worried.
2. Because the file is destroyed during the inspection or deletion, it becomes an uninstalled file in the program management, and you can't delete it if you want, or you are installing the file every time you start up, which is very troublesome to check. You must be worried. Don't panic, I'll tell you a way to delete these things with my own file management, which is easy to get done. To open its own file management, you must bring your own file manager. Otherwise, I can't tell. Press the left selection key to pop up the search, select the memory card, and enter private to find it automatically. Private Hey: All the files that were originally installed on E disk are here. You can even see the three-dimensional sketch of the game, as well as sound files, and hear swords and gunshots. Theme folders with suffix 1 14 are easy to delete after entering. 10202dce folder, damaged files and untrusted files filtered by the system during installation are all in it, and they are in the form of sis. These things have the memory of installation. As long as it is installed in the system as soon as it is turned on, the system will be forcibly isolated, which will take up the luck of the mobile phone. Go to 10202dce and delete it all, so that your problem can be solved.