Issues flashing firmware to custom PCB

RE: Issues flashing firmware to custom PCB

Ekse — Tue, 28 Apr 2026 10:21:10 GMT

Hi Jonathan,

Yes! We actually managed to solve it. The issue was that the qfn48-package wasn’t properly soldered on. We had some suspicion when we realized the DECA rail had no power. We were not sure if it was a configuration issue or if it was supposed to come up by default, but we figured we would try to reflow the chip.

Eventually, after a few tries we saw that DECA got voltage, and after that we were able to flash the device.

Thanks for all the suggestions!

Best Regards,

Mikael, Andreas and Mathias

RE: Issues flashing firmware to custom PCB

JONATHAN LL — Mon, 27 Apr 2026 23:25:15 GMT

Hello there Mathias, Mikael and Andreas!

Often the issue lies with the onboard debugger chip not understanding that the external device is power in some way.

You only need nRF_VDD, GND, SWDI and SWDCLK to be able to program the external device.

Try to power the custom board from the DK it self, I find it easier to source the power and GND from the DK it self with some jumper wires just to make sure the logic levels are all the same.

Have you tested the cable you are using on another setup to confirm that it works?

Also see that its been a few days, maybe you have solved it already?

Regards,
Jonathan

RE: Issues flashing firmware to custom PCB

Ekse — Wed, 22 Apr 2026 10:35:49 GMT

Hi Kazi,

Yes, we have set the level to 3000 mV, which is the same measured on the nRF, and it doesn't change the outcome while flashing. The connections checks out with the debug out connector from the link you sent. Do you have any other suggestions?

Best regards,

Mathias, Mikael and Andreas

RE: Issues flashing firmware to custom PCB

Kazi Afroza Sultana — Mon, 20 Apr 2026 13:23:18 GMT

Hello Mathias, Andreas and Mikal,

It seems like debugger port is unavailable. Is the nRf54L15DK and your customer board are powered by same voltage level? You can set the VDD on board configurator app on the nRF Connect for Desktop app.

You can read this also Debug out for programming external boards to check if the connection is ok.

Thanks.

Kazi