KW45B41Z EVK not programming over on board Debugger MCU Link.

kaif1 — Thu, 23 Jul 2026 07:01:24 GMT

Hi,

I am trying to program the KW45B41Z-EVK using the kw45b41zevk_hello_world SDK example code. When I start debugging, the onboard debugger gets detected, but then I get the following error:

0 Available SWD Devices detected.
Connect a device and try again.

I have connected the USB cable to J14 and left JP22 open (to program using the onboard debugger itself). Also, JP28 pins 1 and 2 are shorted, as mentioned in the KW45UM. However, even after that, I am unable to program and debug the example.

I have also tried the kw45b41zevk_led_blinky SDK example, but it behaves in the same way.

I also tried using an external debugger to debug the board by shorting JP22, as mentioned in the KW45UM, but I am getting the same issue.

I have attached a screenshot of the issue I am facing.

I also tried to erase the flash and write the image using the Secure Provisioning Tool. First, I entered ISP mode by shorting JP25 to enable SW4, then long-pressed SW4 and Reset (SW3). Once the Test Connection passed, I erased the flash (location 0x00000000, size 0x100000) successfully. Then I used the following image:

${SPT_INSTALL_BIN}\data\sample_data\targets\KW45B41Z8\source_images\kw45b41zevk_led_blinky.s19

I was able to build and program the image successfully, and the intended RGB LED1 is also blinking indicating that KW45B41Z microcontroller is working fine. However, even after this, I am still unable to program or debug the board.

Re: KW45B41Z EVK not programming over on board Debugger MCU Link.

Christine_Li — Fri, 24 Jul 2026 10:26:12 GMT

Hi, @kaif1

Which IDE are you using?

MCUXpresso IDE or MCUXpresso for VS Code?

Let me have a try on my side, then let you know the default jumper settings.

Best regards,

Christine.

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KW45B41Z EVK not programming over on board Debugger MCU Link.

Re: KW45B41Z EVK not programming over on board Debugger MCU Link.