Jetson Nano can not booting normally after backup

I wanted to back up the image in the SD card. In the nano environment, I used the command sudo dd bs=4M if=/home/nano.img (later I found that it should be used on the host). The system cannot be started normally after automatic restart.

how can I solve it, at least be able to copy out some important documents.

Dump the log first.

thanks a lot, my board is jetson nano A01, and now it can not booting up normally, it is stuck in this interface
[OK] Start update UTMP about System Runlevel Changes

Are you sure this is the command used? This is incomplete.

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.

Any update? Still an issue to support?