You can delete an imported certificate when the certificate has expired or when an encrypted connection is no longer necessary.
If you obtain a certificate using a CSR created from Web Config, you cannot import a deleted certificate again. In this case, create a CSR and obtain a certificate again.
Enter the printer's IP address into a browser to access Web Config.
Enter the IP address of the network (standard/additional) you want to configure from a computer that is connected to the same network as the printer.
You can check the IP address of the printer from the following menu.
Settings > General Settings > Network Settings > (Standard or Additional) > Network Status > Wired LAN/Wi-Fi Status
Enter the administrator password to log in as an administrator.
Select in the following order.
Network Security tab.
Select one of the following.
Click Delete for CA-signed Certificate or Client Certificate.
Confirm that you want to delete the certificate in the message displayed.