Update Ktag Clone From 2.25 To 2.70

We will perform a software + SD card update only first. This works for 80% of modern clones. Only do the PIC firmware if you get "USB Device Not Recognized" after step 3.

Updating a Ktag clone from 2.25 to 2.70 is not for the faint of heart:

My advice: If your 2.25 clone reads 90% of the cars you work on, stay with 2.25. Only update if you absolutely need support for Bosch MD1 or Delphi DCM6.7. Update Ktag Clone From 2.25 To 2.70

Once v2.70 is installed:

Why? If the software pings the official Alientech server, it will immediately lock your clone’s serial number permanently. We will perform a software + SD card update only first

Most 2.25 clones have a locked bootloader that rejects 2.70 firmware. You need to overwrite it.

  • Open STM32 Flash Loader.
  • Select your COM port (usually COM3 or 4).
  • Choose "Download to device" and load the Firmware_2.70_Boot.bin.
  • Address: 0x08000000.
  • Click "Next". Wait 60 seconds. Do not disconnect.
  • After success, remove the BOOT0 short. Reboot the Ktag.

    • Verification: Plug in Ktag. Go to Windows Device Manager. You should see "Ktag USB" under libusb, not STM32 DFU. My advice: If your 2

    Given the complexity, many tuners now skip the update and simply buy a new Ktag 2.70 clone from reputable Chinese sellers (e.g., VXDIAG, Flyobd). Cost: $150–200.

    These come with:

    Compare that to the $50 risk of bricking your old 2.25 clone. Sometimes, upgrade = replace.