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What should I do if I display an "unsigned" or "installation prompt" certificate error when installing mobile phone software?
Certificate error

Problem description: 1. The installed software is not signed. 2. If it's a JAR program, it's usually because there are conflicting certificates. (Many java games will give this error prompt. See Solution 2 below. )

Solution: 1: software signature;

2. Install programs (software/games) directly on the mobile phone or replace the memory card.