It seems you booting into recovery kernel due to kernel panic.
Why I calculate it as 1992294400 sectors for 950GiB?
Please try using the following XML instead.
flash_l4t_t234_nvme-v2.xml.txt (9.3 KB)
and the following command to flash.
$ sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1p1 -c tools/kernel_flash/flash_l4t_t234_nvme-usr.xml -p "-c bootloader/t186ref/cfg/flash_t234_qspi.xml" --showlogs --network usb0 jetson-orin-nano-devkit internal