Hi,
I just received two new nRF54LM20-DK boards and wanted to run a Matter quickstart demo. Unfortunately, it’s already failing during programming. What could be cause of this error message?
PS. "Hello World" is working on these boards.
2026-03-23T10:51:40.346Z INFO Initialising the bundled nrfutil device 2026-03-23T10:51:41.538Z INFO Using the bundled core version for nrfutil device: 8.1.1 2026-03-23T10:51:41.583Z INFO Using nrfutil device version: 2.14.2 2026-03-23T10:51:41.583Z INFO Using nrf-device-lib version: 0.19.3 2026-03-23T10:51:41.584Z INFO Using nrf-probe version: 0.46.2 2026-03-23T10:51:41.584Z INFO Using SEGGER J-Link version: JLink_V9.24a 2026-03-23T10:51:41.585Z INFO Your version of SEGGER J-Link (9.24a) is newer than the one this app was tested with (8.66). The tested version is not required, and your J-Link version will most likely work fine. If you get issues related to J-Link with your devices, use the tested version. 2026-03-23T10:51:43.350Z DEBUG Selected device: nRF54LM20 DK 2026-03-23T10:51:43.393Z DEBUG Changed step: Info 2026-03-23T10:51:44.842Z DEBUG Changed step: Rename 2026-03-23T10:51:47.861Z DEBUG Changed step: Program 2026-03-23T10:51:49.987Z ERROR Failed to read config descriptor 1: descriptor request failed: device might be suspended. (error 31)
