1. Connect your device to the computer and open the sd card to view files.
2. Delete the files labeled GTT_TIF.GTG and TFILE0, TFILE1, TFILE2, Tfile3 if available and then return to the vehicle.
3. Go back through the install download, you will see code 550 once more. This is normal! Set up your tuning options.
4. After selecting your tuning options return to your computer in order to download the tune files.
5. Open the Update Agent and plug your SD card into the PC.
6. Press start when prompted.
7. Once the download has finished you are ready to return to the vehicle and go through the install download to install your tune.
Click here for code 550.