I upgraded a C60 codec to TC 5.1.5 without a release key . I tried to downgrade it to TC 4.1 but it will not downgrade. Any suggestions on how to downgrade? The reason I do not have a release key for TC 5.1.5 is because the compnay is having a dispute aboot the service contract. So in the meantime I need to get this codec up and running. Thanks
It's highly recommended that you upgrade your C20 to software version TC7.3.3.
If your endpoint does not have an active service contract, you can contact the TAC and request a TC7 release key as per the "Customers Without Service Contracts" section of this security advisory: Cisco-sa-20150320-openssl.
I haven't tried myself to downgrade from TC5.1.5, so not sure if the error message you're getting is normal or not. But to workaround the problem, enable the root account first and use the "selectsw" command to boot on previous image software, which might still have TC4. More details are available on this forum if needed.