Boot error when I try to clone an older xavier whole system to a newer one

sudo echo “u” | sudo dd of=/proc/sysrq-trigger
sudo dd if=/dev/mmcblk0p1 | ssh ubu@192.168.0.85 dd of=/home/ubu/xavier-image.raw
I use command above to back up my older xavier to a host machine
and use follow to clone the image to newer one

cd /home/nvidia/Downloads/Xavier/Linux_for_Tegra/bootloader/
mv system.img system.img.bk
ln -s /home/ubu/xavier-image.raw system.img
cd /home/nvidia/Downloads/Xavier/Linux_for_Tegra/ 
sudo ./flash.sh -r jetson-xavier mmcblk0p1 

and the host terimal return
The target t186ref has been flashed sucessfuly,reset the board to boot from internal eMMC
but through the HDMI, my screen only display the nvidia logo but nothing every, seems that can’t load the linux system ,please help me, I have tried more the 10 time but still fail