(v2.4.0) C:\dm\private\nRF_SDK_Tests\blinky> 
west flash -d build
-- west flash: rebuilding
[0/22] Performing build step for 'tfm'
ninja: no work to do.
[4/14] Linking C executable zephyr\zephyr_pre0.elf

[7/14] Linking C executable zephyr\zephyr_pre1.elf

[12/14] Linking C executable zephyr\zephyr.elf
Memory region         Used Size  Region Size  %age Used
           FLASH:       31068 B       992 KB      3.06%
             RAM:        6072 B     211608 B      2.87%
        IDT_LIST:          0 GB         2 KB      0.00%
[14/14] Generating zephyr/merged.hex
-- west flash: using runner nrfjprog
Using board 506003622
-- runners.nrfjprog: Flashing file: build\zephyr\merged.hex
[error] [ Worker] - Low voltage 0 detected in target device.
[error] [ Client] - Encountered error -12: Command read_device_info executed for 15 milliseconds with result -12
[error] [ Client] - Encountered error -2: Command read_memory_descriptors executed for 0 milliseconds with result -2
Failed to read device memories.
[error] [ Worker] - Cannot call read_access_port_register when connect_to_emu_without_snr or connect_to_emu_with_snr has not been called.
ERROR: Requested operation is currently unavailable.
ERROR: Check logs for more details.
NOTE: For additional output, try running again with logging enabled (--log).
NOTE: Any generated log error messages will be displayed.
FATAL ERROR: command exited with status 66: nrfjprog --program 'build\zephyr\merged.hex' --sectorerase --verify -f NRF91 --snr 506003622