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My equipment started at version 9.9 and I upgraded it to 9.15.6 only so that I could then upgrade it to the latest, which at the time was 11.x. I'm not sure if you are asking if I still have the actual firmware files because you need them, or if I st...
I had this same issue. I fixed it by upgrading the firmware on the Cisco Codec Plus. It was an older version (9.9) and I had to use the 9.15.6 StepUpgrade firmware and then finally I could update it to latest (RoomOS 11.x at this time).