def update(self, friendly_name=values.unset, device_sid=values.unset):
return self._proxy.update(friendly_name=friendly_name, device_sid=device_sid, )<EOL>
Update the CertificateInstance

:param unicode friendly_name: The human readable description for this Certificate.
:param unicode device_sid: The unique identifier of a Device to be authenticated.

:returns: Updated CertificateInstance
:rtype: twilio.rest.preview.deployed_devices.fleet.certificate.CertificateInstance