add remote

flash example to usage guide

USAGE_GUIDE.md

@@ -35,6 +35,18 @@ sudo ./flash_sdcard.sh
 
 3. Follow the prompts to select your SD card device
 
+### Flashing an Image from a Remote SSH Host
+
+If your SD card image was created on a remote host (e.g., 192.168.50.3), you can copy it to your local machine and then flash it to your SD card. For example, if the image is located at `/home/user/output.img` on the remote host:
+
+You can do this in a single command (replace `user`, the image path, and `/dev/mmcblk0` as needed):
+
+```bash
+ssh user@192.168.50.3 "cat /mnt/nvme/repos/buildroot/output/images/sdcard.img" | sudo dd of=/dev/mmcblk0 bs=4M status=progress conv=fsync oflag=direct
+```
+
+**WARNING:** Double-check the device path (`/dev/mmcblk0`) to avoid overwriting the wrong disk!
+
 ## Initial Boot
 
 1. Insert the SD card into your Raspberry Pi 3