Thrustmaster T128 Anleitung Seite 8

Next, as indicated by the Firmware Updater message, disconnect and then
reconnect the racing wheel's USB connector in order to validate the procedure.
The firmware updater program will then indicate whether the procedure has
completed successfully.
The racing wheel self-calibrates (i.e. the wheel rim automatically rotates to the left
and right), and then its LED turns back on again.