Hi @ieren1503 ,
it looks like that you do not have install / unpack the sample root filesystems in the rootfs folder.
Take a look in your: /Data/Linux_for_Tegra/rootfs/
Is there only a readme file?
If yes,
Download:
https://developer.nvidia.com/downloads/linux-sample-root-filesystem-r3521aarch64tbz2
Untar Jetson Linux.
$ tar xf Jetson_Linux_R35.2.1_aarch64.tbz2
Go to Rootfs
$ cd Linux_for_Tegra/rootfs/
Extract Rootfs
$ sudo tar xpf …/…/Tegra_Linux_Sample-Root-Filesystem_R35.2.1_aarch64.tbz2
Go to Linux_for_Tegra
$ cd Linux_for_Tegra
Install the flashing prerequisites.
sudo ./tools/l4t_flash_prerequisites.sh
Apply the binaries.
$ sudo ./apply_binaries.sh
And unpack the content in the tar directly in your rootfs folder (without subfiles).
Try to flash again.
sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1p1 -c tools/kernel_flash/flash_l4t_external.xml -p “-c bootloader/t186ref/cfg/flash_t234_qspi.xml” --showlogs --network usb0 p3509-a02+p3767-0000 internal
Good luck.