Hello, please try the following methods: 1. Go to Tools → Program Management → Options → Settings → Software Installation → Set to On. Online certificate check → set to off, and adjust the mobile phone time to the valid use period of the certificate; It is recommended to transfer to six months ago. 2. To make a mobile phone certificate, I suggest you log in to the 3g.cn website with your mobile phone, go to the homepage of the website, click on the community, and enter the software channel-Saipan S60 third edition visa system to apply. Then enter your mobile phone serial number to enter the certificate application (the mobile phone serial number can be obtained by pressing *#06#). In general, the system will prepare the certificate for you within 24 hours after submission. You can enter the current page at any time to check the progress of certificate making. After passing, you can enter the serial number, click the serial number of your mobile phone, and view all the software signed for you. It can be downloaded, installed and used.