I have setup the flash environment for jetson nano 2g devkit. And then follow the nvidia document to backup the app img from my device. However, it seems to be blocked and never provide any feedback for more than an hour.
~/Desktop/Linux_for_Tegra$ sudo ./flash.sh -r -k APP -G backup.img jetson-nano-2gb-devkit mmcblk0p1
###############################################################################
# L4T BSP Information:
# R32 , REVISION: 7.3
###############################################################################
# Target Board Information:
# Name: jetson-nano-2gb-devkit, Board Family: t210ref, SoC: Tegra 210,
# OpMode: production, Boot Authentication: ,
# Disk encryption: disabled ,
###############################################################################
./tegraflash.py --chip 0x21 --applet "/home/qwang/Desktop/Linux_for_Tegra/bootloader/nvtboot_recovery.bin" --skipuid --cmd "dump eeprom boardinfo cvm.bin"
Welcome to Tegra Flash
version 1.0.0
Type ? or help for help and q or quit to exit
Use ! to execute system commands
[ 0.0027 ] Generating RCM messages
[ 0.0065 ] tegrarcm --listrcm rcm_list.xml --chip 0x21 0 --download rcm /home/qwang/Desktop/Linux_for_Tegra/bootloader/nvtboot_recovery.bin 0 0
[ 0.0079 ] RCM 0 is saved as rcm_0.rcm
[ 0.0098 ] RCM 1 is saved as rcm_1.rcm
[ 0.0098 ] List of rcm files are saved in rcm_list.xml
[ 0.0099 ]
[ 0.0099 ] Signing RCM messages
[ 0.0400 ] tegrasign --key None --list rcm_list.xml --pubkeyhash pub_key.key
[ 0.0411 ] Assuming zero filled SBK key
[ 0.0486 ]
[ 0.0486 ] Copying signature to RCM mesages
[ 0.0526 ] tegrarcm --chip 0x21 0 --updatesig rcm_list_signed.xml
[ 0.0535 ]
[ 0.0535 ] Boot Rom communication
[ 0.0555 ] tegrarcm --chip 0x21 0 --rcm rcm_list_signed.xml --skipuid