1. About car anti-theft decoding matching:If the ECU is installed, the car can not be started. check if the car is with anti-theft function or whether the key has a chip.If your car is with anti-theft function, it is necessary to decode the match (with the decoder) successfully, then the car can start normally. 2. About installation:Please find a professional auto repairman to install, and check voltage on the vehicle before installation. When installing, plug in the plug for test run, make sure there is no problem, and then fix the screw. Note: before installing a new product, check and find out the cause of broken of the previous original computer board to avoid burning the computer board again with the same fault. During installation, check whether the voltage and circuit are normal and whether the grounding is good. The normal voltage of the computer board is 12V. Do not install when the voltage is higher than the normal voltage, otherwise the computer board may be burned. fit for G520 ME17.9.11.1 Colour:Silver&Black Material:Metal + Plastic Package Contents: 1 x Car Engine Computer Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.