Docs (readme) says that D12 should be P0.09 in the nRF54l15dk https://github.com/Lora-net/usp_zephyr/blob/5da1e64bd96810ceaa0b2c2cdabec0ab102dc6a0/README.md?plain=1#L595 But in fact, the P2.09 is used (as it should be) https://github.com/Lora-net/usp_zephyr/blob/5da1e64bd96810ceaa0b2c2cdabec0ab102dc6a0/boards/shields/semtech_nrf54l15dk_mbed_interface/semtech_nrf54l15dk_mbed_interface.overlay#L31