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What should I do if I am prompted that I don't have a digital signature certificate when installing Android software?
That's a software problem. When developing Android, you need a certificate and password made by the developer. This certificate and password should be packaged into your installer. When you install an Android phone, the background needs to check whether your software has a certificate. If not, checking unknown items is useless. A certificate is equivalent to an ID card. You don't have a certificate. I suggest you take the exam again! ! !