fast check CAS and key working or not without connecting to for BMW Update: This for BMW CAS cannot be updated Support System: No need to connect with computer, just follow the instruction steps show How does for BMW CAS Test Platform work?1. Connect and test for BMW CAS3. 2. Connect and test for BMW CAS2. 3. Note: the red cable of CAS2 / CAS3 should be plugged into the first pin of socket.4. After the 12V power is connected, the power light ON and the LED light of the CAS test platform will continuously fast flash once a second, it indicates the CAS CPU work well, if the LED light not ON, it indicates CAS is abnormal and need to repair or change. 5. Insert for BMW key into CAS test platform mainframe and you will hear buzzer and see the CAS power adapter green indicator ON, it indicates the key and the CAS work well; otherwise it indicates the key is broken or the key doesn't program successfully. After for BMW CAS test platform is connected with the full-new CAS3, the LED light will not ON, only after the EEPROM data is written into can the LED light on. for BMW CAS Test Platform help you find out where is the fault: Connect for BMW CAS test platform to CAS, and after connected with the power, the LED light on or not will help judge the where the fault is. 1. After connected to the power, the CAS test platform LED light on for a long time, it indicates the CPU FLASH data loss, advice you write into the FLASH data from another for BMW model of the same year. 2. After connected to the power, the CAS test platform LED light not ON, it indicates the CPU FLASH data is locked caused by the unstable programmer when writing data, you need to edit EEPROM data. 3. The CAS3 is broken when programming and can't start the car, then use BMW CAS Test Platform to connect CAS, after connected to the power if the LED light on for a long time, it indicates the FLASH data missing and EEPROM data is locked. Colour:Photo Color Material:plastic Package Contents: 1 x CAS Test Platform 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.