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What is Code 550?

This means that the tune files have been selected and need to be downloaded from the Bully Dog server. You will need to go to a Windows computer and open the update agent. Once update agent is open, put the SD card into the SD card reader. You may then click on "start" to download tune (this is not update the device). Once files have been downloaded you may return to your vehicle and select install download in the menu. After the disclaimers you will select continue with selected tunes to select tune (A, b or C) you want installed.