The KTAG stores firmware on an internal SD card.

Using a tool like STM32CubeProgrammer via SWD or built-in bootloader:

  • Gather resources:
  • Tools and hardware:
  • Read documentation:
  • But many clone 2.70 versions are unstable – 2.25 clones are often more reliable.


    K-TAG is a popular tool for reading and writing ECU (Engine Control Unit) data, widely used in chip tuning. However, original units are expensive, leading many to purchase clones (unauthorized copies). A frequent question among clone users is: Can I safely update my K-TAG clone from firmware version 2.25 to 2.70?

    The short answer: It is possible, but risky. This guide explains the process, risks, and success factors.

    Yes – but only if your clone hardware is compatible. Many clones sold as “2.70 ready” have specific chips (e.g., FTDI, STM32) and modified bootloaders. Attempting a direct update from 2.25 to 2.70 on a standard clone often bricks the device because:

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