The solutions that the bank's app loan acceptance voucher can't be opened are: check the network connection, update the app of China Bank, and contact the customer service of China Bank.

1. Check the network connection: Please make sure that your device is in a good network connection state, because network problems will cause the certificate not to be opened normally.

2. Update China Bank app: Please make sure to use the latest version of China Bank app, because there may be some bugs or problems in the old version. If the app needs to be updated, please update it in the App Store.

3. Contact the customer service of China Bank: If the above methods have been tried but the problem has not been solved, you can contact the customer service of China Bank and ask the customer service staff how to solve this problem. Customer service can help users solve problems through remote assistance or providing other solutions.