The T3 is a very old unsupported ECU and is only available with our old obsolete Desc software package.
Depending on what machine you are using you may need to play around with the Windows compatibility mode or run a virtual XP machine for it to work.
When you connect to the ECU it will require a profile for you to be able to read the maps out. If you can send me a screenshot of what it comes up with then I can find the matching profile for you.
A link to the Desc software can be found below, simply copy the whole folder to your machine and run the .exe
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