![]() SIP firmware versions of those dual-key firmwares, however, are not readily available. In between, however, there were a few firmware versions that included the keys for both old and new. Somewhere along the line Cisco changed the authentication keys used to validate the firmware, and old firmware will refuse to validate new firmware. The problem is that the firmware in the phone validates any new firmware upload before installing it, and it does it using built-in authentication keys. To a recent firmware build without first loading an intermediate firmware. I did a factory reset and soonĭiscovered that one cannot upgrade from the factory state ![]() ![]() I recently purchased a used Cisco 7970 phone and wanted toĬonvert it to use the SIP protocol.
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