About the production of nano module image files

Dear Sir,
I am having trouble making a mirror of the nano module. I now have the Linux_for_Tegra 4.2.2 downloaded via sdkmanager.
I make sure that the nano board to be mirrored has entered recovery mode and connected to the pc via usb.
Execute the command: sudo ./flash.sh -r -k APP -G /home/somebody/system.img jetson-nano-emmc mmcblk0p1
It gives the following error: 00000004: Failed to get an accessor of secondary boot device

Someone suggested that I use TX1 to create an image file. I also tried.
https://www.elinux.org/Jetson/TX1_Cloning
The input command gets the same error.
Is there any reliable step or reference for making nano module image files?

some photos
file:///home/hzsj/Pictures/2019-10-08%2013-21-24%20%E7%9A%84%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png

file:///home/hzsj/Pictures/2019-10-08%2013-30-00%20%E7%9A%84%E5%B1%8F%E5%B9%95%E6%88%AA%E5%9B%BE.png

according to the link:

sudo ./tegraflash.py --bl cboot.bin --applet nvtboot_recovery.bin --chip 0x21 --cmd "read APP my_backup.img"
Welcome to Tegra Flash
version 1.0.0
Type ? or help for help and q or quit to exit
Use ! to execute system commands
 
[   0.0343 ] Generating RCM messages
[   0.0530 ] tegrarcm --listrcm rcm_list.xml --chip 0x21 0 --download rcm nvtboot_recovery.bin 0 0
[   0.0563 ] RCM 0 is saved as rcm_0.rcm
[   0.0860 ] RCM 1 is saved as rcm_1.rcm
[   0.0860 ] List of rcm files are saved in rcm_list.xml
[   0.0861 ] 
[   0.0862 ] Signing RCM messages
[   0.1218 ] tegrasign --key None --list rcm_list.xml --pubkeyhash pub_key.key
[   0.1262 ] Assuming zero filled SBK key
[   0.1441 ] 
[   0.1442 ] Copying signature to RCM mesages
[   0.1458 ] tegrarcm --chip 0x21 0 --updatesig rcm_list_signed.xml
[   0.1482 ] 
[   0.1483 ] Boot Rom communication
[   0.1496 ] tegrarcm --chip 0x21 0 --rcm rcm_list_signed.xml
[   0.1510 ] BR_CID: 0x32101001644568011000000004080280
[   0.1518 ] RCM version 0X210001
[   0.1650 ] Boot Rom communication completed
[   1.1731 ] 
[   1.1733 ] Reading BCT from device for further operations
[   1.1733 ] Retrieving storage infomation
[   1.1771 ] tegrarcm --oem platformdetails storage storage_info.bin
[   1.1811 ] Applet version 00.01.0000
[   1.1997 ] 00000004: Failed to get an accessor of secondary boot device
[   1.1998 ] 
[   1.2214 ] tegradevflash --oem platformdetails storage storage_info.bin

hello 1251566963,

please check similar discussion thread, Topic 1064498 for reference,
thanks