Security | Machine Digital Certificate Management only has the options to create a self-signed certificate or certificate signing request. There is no import option.
Security | IEEE 802.1X only shows EAP-MD5, EAP-MS-CHAPv2, and PEAP / MS-CHAPv2 for authentication methods. We use EAP-TLS on the 6515 and 8000s, which allow you to choose an imported device certificate to present to the authentication server.
The Last Successful Upgrade shows Version 1.200.35. Am I missing something or is there newer software that enables these features on the C60
You will find all the latest firmware and downloads HERE.
I would recommend contacting the Support Department for more information on your question. The support options for your device are listed HERE.
You can't import one until you create one, Create the self signed, reboot and the option to import will appear.