KESS3 Master Tuning KitThe Master version of the KESS3 allows you the flexibility to read and write to the ECU without limits. The Master tool will read and save an "unlocked" file. Once the Master files have been read and saved, you can use a calibration editing software, like our ECM Titanium, to make the changes to the file. After saving the file, the modified version can be rewritten to the ECU using the Master tool; this is also known as FLASHING. During the "flashing"