I also think the theme of Magic Show Network is not good. After several times, the last minute of installation showed that it needed money, and it was 2 yuan each, which was clearly free. You have to apply for a certificate for your mobile phone first, and then you can sign the software with this certificate. This is an authentication process. I applied for a certificate on Eurocool. Just send me the IMEI number of my mobile phone, and I will have the certificate in a day ~