1.First be sure the CN900 Key Programmer is the latest or higher Version 126.96.36.199
2.Please connect the CN900 with the 4D DECODE BOX before turn on the power.
3.Please insert the 4D key which you want to copy in the testing hole of CN900 .
Click the Identify&Copy button Of the CN900
Do not move the 4D key and keep it in the testing hole of CN 900 .And and then click the “Decode” button of CN 900
After click the Decode button then it start to decode.(Notice: Do not move the 4D key which you want to copy)
Till you see Decode this word on the CN900 screen become Copy this word then it mean decoding successfully.