If the U-Shield signature of Minsheng Bank collapses, you can try the following methods to solve it: 1. Unplug the U shield, plug it in again, and try to use other USB ports or other computers; 2. Maybe the U shield is broken. You can try to format the U shield or change it to a new one. 3. Check whether the latest U shield driver, certificate and corresponding USB driver of Minsheng Bank are installed on the computer. If the above methods can't solve the problem, I suggest you consult the customer service of Minsheng Bank and seek professional technical support.