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Why is there a signature conflict when installing games on mobile phones?
This is normal. That's because you haven't changed apk. If you change the apk, you will know that the changed apk needs to be signed before installation. If the signature is changed, it will be different from the original software, but the program name is the same, which will prompt a conflict.

Signature is the final check of the program, and the program name is not what you seem. For example.