How to downgrade Tandberg codec C20 from ver.5.1.7 to ver.3.1.2

Hi! I have a TANDBERG Codec C20 in my company. Serial number: F1AN37C00167. I didn't use it more than 1 year but when I've found a use for it, I upgrade it to a current version of the firmware TC5.1.7.299667. Unfortunately, I did not know what to use it I need a release key.
The system has valid release keys only for TC3 and TCNC3.
So I downloaded from http://ftp.tandberg.com/pub/software/endpoints/tc/ all TC3 firmwares and tried to downgrade to them but any times upload procedure is aborting with message "Corrupt software-package uploaded".
My codec was shipped with TC3.1.2.
What to do? Can you help me to downgrade back?
Thanks in advance!
And sorry for my english, please :-)

How could you possibly upgrade it successfully to TC5.1.7 if you didn't have a release key? The upgrade should have failed and reverted back to TC3.1.2 without you doing anything.
Having said that, you really need to upgrade, not downgrade, see the following security bulletin for how to obtain fixed software for customers without a valid service contract:
http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20140605-openssl
Scroll down to "Software Versions and Fixes", expand this and go to "Obtaining Fixed Software" then see "Customers Without Service Contracts".
/jens
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