Continuing the discussion from Jetson Orin Nano will not boot after flashing SD:
Please download SDK Manager to your host and follow user guide steps to re-flash BSP on your Orin Nano devkit.
Download link: SDK Manager | NVIDIA Developer
User Guide: NVIDIA SDK Manager Documentation — SDK Manager 2.1.0 documentation
Install Jetson Software with SDK Manager — SDK Manager 2.1.0 documentation