Disk Encryption of External sda in jatson AGX xavier(RS32.7.1 js4.6.1)

sorry so late to replay u
I try to use the RS32.6.1 enviroment finishing external flashing
i run the commend:

sudo ./tools/kernel_flash/l4t_initrd_flash.sh --external-device nvme0n1p1 -c ./tools/kernel_flash/flash_l4t_external.xml  --external-only -S 30GiB --showlogs jetson-agx-xavier-devkit nvme0n1p1

but the log show error

Error: Return value 4
Command tegraparser_v2 --pt flash.xml.tmp
Error: /home/weitianyu/external/flashtool/Linux_for_Tegra/bootloader/signed/flash.idx is not found
Error: failed to relocate images to /home/weitianyu/external/flashtool/Linux_for_Tegra/tools/kernel_flash/images
Cleaning up...

i have queried forum https://forums.developer.nvidia.com/t/issue-with-flashing-an-nvme-ssd-with-initrd/185866/9
they solve the question by using secureboot RS32.6.1 ,but i just use it .
if i need use the secureboot RS32.7.1?
thanks