nrfutil device program 54l15 external spi flash problem

Question

hi support team, 
 docs says we can program 54l15 external spi flash ,please refer to : https://docs.nordicsemi.com/bundle/nrfutil/page/nrfutil-device/guides/programming_external_memory.html 
 and i copied this : https://docs.nordicsemi.com/bundle/nrfutil/page/nrfutil-device/guides/programming_external_memory.html#example-for-spi-on-nrf54l15 as jason file:

Fullscreen 
 8037.54L15.json 
 Download 
 
 {
 "firmware_config": {
 "peripheral": "SPIM00"
 },
 "pins": {
 "sck": 65,
 "csn": 69,
 "io0": 66,
 "io1": 68,
 "io2": 67,
 "io3": 64
 },
 "flash_size": 8388608,
 "page_size": 4096,
 "sck_frequency": 8000000,
 "address_mode": "MODE24BIT"
}

and it tells us to using 0x10000000 address for file:

i tried , but find one problem, when i program hex to external flash the internal flash is erased: 
 1: C:\Users\William>arm-none-eabi-objcopy -I binary -O ihex --change-address 0x10000000 C:
cs2\v3.1.0-preview4
rf\samples\dfu\dfu_target\build\dfu_target\zephyr\zephyr.bin zephyr1.hex 
 2: C:\Users\William>nrfutil device --x-ext-mem-config-file C:\Users\William\Desktop\54L15.json program --firmware C:\Users\William\zephyr1.hex --options ext_mem_erase_mode=ERASE_RANGES_TOUCHED_BY_FIRMWARE,verify=VERIFY_READ [00:00:03] ###### 100% [4/4 1057740301] Programmed 
 3. but i found out the internal flash 0f 54L15 is erased. 
 C:\Users\William>nrfutil device --x-ext-mem-config-file C:\Users\William\Desktop\54L15.json read --address 0 1057740301 0x00000000: FFFFFFFF |....| 
 C:\Users\William>nrfutil device read --address 0 1057740301 0x00000000: FFFFFFFF |....| 
 4. where extern spi flash is correct: 
 C:\Users\William>nrfutil device --x-ext-mem-config-file C:\Users\William\Desktop\54L15.json read --address 0x10000000 --bytes 256 --width 8 1057740301 0x10000000: 40 2A 00 20 31 F5 00 00 8F 66 01 00 1D F5 00 00 |@*. 1....f......| 0x10000010: 1D F5 00 00 1D F5 00 00 1D F5 00 00 00 00 00 00 |................| 0x10000020: 00 00 00 00 00 00 00 00 00 00 00 00 AD F6 00 00 |................| 0x10000030: 1D F5 00 00 00 00 00 00 49 F6 00 00 1D F5 00 00 |........I.......| 0x10000040: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x10000050: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x10000060: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x10000070: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x10000080: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x10000090: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000A0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000B0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000C0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000D0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000E0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 0x100000F0: 71 F8 00 00 71 F8 00 00 71 F8 00 00 71 F8 00 00 |q...q...q...q...| 
 here is my zephyr1.hex: 
 
 7041.zephyr1.hex 
 so i guess one of my command parameter is not correct: 
 Regards, 
 William.