Specific steps:
1. Log in to the electronic tax bureau, click "My Information" in the menu bar on the home page to enter user management, select certificate management, and switch to the cancellation tab of CA certificate/electronic business license.
2. Click the logout button to pop up the confirmation dialog box.
3. Click OK and choose to cancel the signed electronic business license.
4. After generating the QR code, use the electronic business license applet or Shanghai CA card transfer APP to scan the code, and the cancellation can be successful only after the code scanning is successful.