How to solve the "204 error" for MB SD C4?

If your MB SD C4 Device appear following errors, it shows that your device hardware program was deleted:


If your device hardware program was deleted, you would be unable to set the wifi and SD C4 number .

Solution: you need to update following three files for the 
hardware program, Upgrade order 02-> 01-> 03 (contact our customer sevice for upgrade instruction):

update files

Notice: When updating, you not only need to Install new batteries, but also need to use obd cable to connect the car and the device.
( If you can not connect the vehicle, you can use OBD 12V power supply instead, otherwise, there will be 662 error, then update falied.)