In my experience it's very normal (as well as disappointing) that TWC techs know nothing about TiVo or Tuning Adapters. The last tech I had at my home said he had been working for TWC for two years and never encountered such equipment. He said in their training classes the only coverage of them was to mention that they existed. I do suspect that my TWC region, Southwest Ohio is worse than some others in that respect.
Your TA is a Motorola (now Arris) brand. Here is a thread discussing the latest software versions for that:
There are other threads giving more detail but you can do the searching to find them.