Hello @kutay ,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
I'd like to know does a similar error still happen when you try other debug tools?
Please attached the circuit of MCU(how did you connect it with MCU)?
You can also refer to the following post: How To Sucessfully Program a Custom made Kinetis Microcontroller Board. - NXP Community
Have a great day,
Celeste
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