The solution for "nRF Connect SDK Intermediate - Lesson 9 Exercise 5" does not appear to boot-up after flashing and gives the following output on the com port:
*** Booting MCUboot v2.1.0-dev-9b4ae4cbc9e2 ***
*** Using nRF Connect SDK v3.1.1-e2a97fe2578a ***
*** Using Zephyr OS v4.1.99-ff8f0c579eeb ***
W: Failed reading sectors; BOOT_MAX_IMG_SECTORS=128 - too small?
E: Image in the primary slot is not valid!
E: Unable to find bootable image
It worked fine on nRF54L15-DK, but it's not working on the nRF54LM20-DK.
Here is my set-up:
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Hardware: nRF54LM20-DK
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nRF Connect SDK: v3.1.1
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nRF Connect Toolchain: v3.1.1
- nRF Connect for VS Code: 2025.9.798
