Nrf54LM20A_DK vscode cannot be programmed

[john.liu]

hi:

nRF54LM20A_DK board vscode cannot be programmed.

-- west flash: using runner nrfutil -- runners.nrfutil: mass erase requested

-- runners.nrfutil: reset after flashing requested

-- runners.nrfutil: Flashing file: C:\ncs\v3.1.1-john\nrf_desktop\build\merged.hex

Error: One or more batch tasks failed:

* 1051847907: Device error: Unable to recognize the device: Unknown part number 0x00000033 (Generic)

FATAL ERROR: command exited with status 1: nrfutil --json device x-execute-batch --batch-path 'C:\ncs\v3.1.1-john\nrf_desktop\build\generated_nrfutil_batch.json' --serial-number 1051847907

[psychogenic]

This was super annoying, same for me with two LM20B boards.  Did a bunch of things, had all the latest version of SDK, nrfutil, etc then even downgraded JLink to version 9.24a, no go.  But solution: upgrading nrfutil devices.

Running an `nrfutil upgrade` did this:

nrfutil-completion is already the newest version (1.5.0)
Downloading nrfutil-device-x86_64-unknown-linux-gnu-2.19.4
Verifying nrfutil-device-x86_64-unknown-linux-gnu-2.19.4
Updating nrfutil-device to 2.19.4
[00:00:05] ###### 100% [Upgrade packages] Upgrade packages

And things started working, even if I'd done the same only 2 days prior..?  In any case, re-updated JLink to v9.6.0 and it still works.