@ Maxpax:
Back then I successfully upgraded my i3 (bought about 3 years ago) with the instructions from
this post. When I look at your original config file, then all the lines essential for the hack are missing. Which means that you have a later hardware revision and / or firmware version. And please note the last line of the linked post. My TIC was able to do the full 144 but it seems yours really only can do 80.
And the 120 you mentioned
here are from the config file you copied from the pdf with the instructions. Because the "new" config file is successfully loaded (which means you did all the # ID and # CRC01 stuff correctly
) this parameter is set but sadly because of the hardware / firmware this parameter doesn't do anything.
And even if it did, you really seem to have only a 80 sensor.
And the timestamp from January 1st 2000 is just a default time if the actual time isn't set, this doesn't mean the TIC is 15 years old.
I have no idea why the i-Series has three different types of sensors but it seems that you just have the wrong one.