If the ca certificate signature fails, you can try the following methods:

1. The first step is to upgrade your line assistant software. Before upgrading, you need to uninstall the original one.

2. The next step is to open the control panel, add or delete programs, and uninstall all software with the words "OK" and Jiangsu CA.

3. After uninstalling, you need to restart the computer.

4. After restarting the computer, close all anti-virus software on the computer.