8961 IP Phone constantly requests CTLSEP MAC .tlv after factory reset

I have an 8961 IP phone running "sip8961.9-0-0-70dev". When the config is erased (All) the phone resets but constantly asks the TFTP server for CTLSEP<MAC>.tlv. There is no CTL file, nor has there ever been security configured.
How can I stop the phone asking for CTLSEP<MAC>.tlv and get on with downloading its config/firmware upgrade?
Thank-you
-Rob.

This is part of the Communications Manager Security By Default feature. After the phone boots, obtains an IP address, and the address of a TFTP server, the first files it will ask for are the CTL and the ITL file. This is used to determine if the phone requests a signed configuration file or not.. This is an example of a signed configuration file..Security is enabled by default on cucm 8.0 and above.

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