It's been too long for me to remember what version TSB was applied, but I can tell you the service advisor at my dealer applied I think, 017A without my consent..... I was livid. They replaced my ECU without that version applied. It was better - restored to the sensitivity of the original, But NOT exactly the same..Agree with the others - there is No going backward, once uploaded, it's done. The ECU updates were intended to make the 07s drive more like the 08s, with throttle sensitivity. I feel it lagged - almost hesitant. I argued and went with a drive with the Service manager. he was able to order and install the new ECU. Like I said, better more like the original feel, BUT not the same. Anyway, after 2.5 years of ownership, Love This Car.