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Mobile phone installation files need to be signed.
Download a mobile phone signature software on the Internet and install it in the mobile phone. After installation, open the software, and the certificate, key and path of the software to be signed will be displayed. Open the paths of these three files respectively, and then click the signature in the menu. It will generate a sisx software with the same name in the directory where you originally want to sign the software, and you can install the software.