When installing software, we often encounter the problem that the application is not installed, especially when updating software or extracting software from rom. So how should we deal with this problem? I'll give you some solutions to this problem.

Step reading

The reason why the application is not installed.

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Software signatures are inconsistent. This usually happens when the software is updated. For example, if you have previously installed an old version of a software, and the signature of the software you need to update is not the same as that of the software you previously installed, you cannot install the application.

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The software is not signed. This usually happens when you extract the software from the rom package or you modify it yourself without re-signing.

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The system version required by the application is different from your mobile phone version. For example, a mobile phone software requires Android system to be above Android2.3, but your mobile phone Android system is Android2.2, and the application is not installed.

Method step

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In the case of inconsistent software signatures, it is necessary to uninstall the previous old version before installing the new version. Go to phone settings → application settings → manage applications → click software → uninstall.

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For unsigned software, this requires a signed software, Baidu zipsigner, to install this software and sign the required software after opening it. 1 shows that the software to be signed has been found; 2 is the place where signature software is saved; Note change signed.zip to the software name. apk。 For example, if you sign QQ, QQ.apk is mainly easy to find. 4 is to start signing a contract. When finished, go to the directory you set, find the software and start the installation.

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For the lack of system requirements, you are Android2.2, and the software requirements are Android2.3 or above. You can only know whether there is a lower version of this software or an upgraded system.

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If you are a machine friend with root permission, there is another way to install unsigned software, that is, put this software into system/app through root file manager, and modify the permissions as shown in the figure. Remember to click "Hang up and read" in the upper right corner, and then restart the phone.

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Also, you can sign on the computer side, but you need to set up a java environment, please Baidu. Then search apksign to download the direct signature.