Matter Lock Example not starting on nRF54LM20-DK

RE: Matter Lock Example not starting on nRF54LM20-DK

Amanda Hsieh — Thu, 26 Mar 2026 12:54:19 GMT

Please contact your regional sales manager or use the form of Sales related questions for the help.

RE: Matter Lock Example not starting on nRF54LM20-DK

Ronald Reichmuth — Thu, 26 Mar 2026 07:37:40 GMT

Hi Amanda,

Basically, I want to use the nRF54LM20A. As far as I know, the DK (nRF54LM20-DK) is always equipped with the B version. That means I would like to use the “nrF54lm20dk/nrf54lm20a/cpuapp” board.

RE: Matter Lock Example not starting on nRF54LM20-DK

Amanda Hsieh — Tue, 24 Mar 2026 16:58:26 GMT

(updated)

nRF54LM20b is planned for v3.3.0.

This should land in NCS main in a few days.

https://github.com/nrfconnect/sdk-nrf/pull/27570

We only test and verify nrf54lm20dk/nrf54lm20a. See Requirements

I need to check with the team for nrf54lm20dk/nrf54lm20b.

RE: Matter Lock Example not starting on nRF54LM20-DK

Ronald Reichmuth — Tue, 24 Mar 2026 16:11:23 GMT

Hi Amanda,

in 'CONNECTED DEVICES' you have NRF54LM20A_xxAA_ENGA. But my board is showing "NRF54LM20B_xxAA_ENGA" thats the only diference I see.

RE: Matter Lock Example not starting on nRF54LM20-DK

Ronald Reichmuth — Tue, 24 Mar 2026 06:44:01 GMT

Hi Amanda,

yes, I get the logs from “Hello World” and “Blinky”, but no output from the Matter examples.

RE: Matter Lock Example not starting on nRF54LM20-DK

Amanda Hsieh — Mon, 23 Mar 2026 19:55:37 GMT

[quote user=""]"Blinky" and "Hello World" works. [/quote]

Are you able to get the log from the "Hello World" sample? You can also test it with the nRF Connect Serial Terminal application and press reset on the DK to print the output.

Could you provide a picture of the white sticker on the DK?

RE: Matter Lock Example not starting on nRF54LM20-DK

Ronald Reichmuth — Mon, 23 Mar 2026 19:29:21 GMT

Hi Amanda,

yes, there are two ports, but neither of them has any logs.

RE: Matter Lock Example not starting on nRF54LM20-DK

Amanda Hsieh — Mon, 23 Mar 2026 16:58:50 GMT

Hi Ronald,

I can get the Matter Lock log from nRF54LM20A-DK as the following figure without modification:

There are two virtual COM ports on the nRF54LM20A-DK. Could you try to connect both ports to see if you can get a log from one of them?

Regards,
Amanda H.