I have just installed it but I can't get it to talk with my certification unit. Tried the 14 presses on START button (nothing happened) and via TechStream 12.20.024 but TechStream said it could not initialize the ECU. Eventually I ran out of battery and needed to charge my AUX battery. No harm though, I have disconnected the RES V4 ECU and will try later. Did not type in my VIN in TechStream, maybe that will make a difference. We'll see
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