Problem：
My Mercedes star diagnostic C4 Prompt appears "Switch on ignition" when diagnosing my car. What is the problem ?
Solution:
This is probably due to a bug in the program that requires upgrading from C4 and updating the program again. If you don't know how to update the program, you can contact us and our technicians can teach you for free.
The MB SD C4 i bought can not save the xentry data, each time i need to reactivate it and then paste the code again, it is too much time-costing.
i chat with chinacardiags.com online services, chat with seven, and she helped me to solve the problem.
Just share with you.
Firstly: find the directory: C:ProgramData/LicDir and then delete the other files except:
only keep the three files,
and secondly activate the xentry by yourself with keygen or send to seller’s Email: sales@obd2tool.com to get activation code to activate it.
thirdly: go to C:ProgramData/LicDir and find the data lic_key_2.dat, copy it and paste it, and then rename the file to lic_key_2.x4711.
and then click it yes. and right click it and make it as read only.
