Flash the Jetson Orin Nano

Hi, This is my first time to use Jetson series, I want to operate latest version of JetPack.
I have trouble in flash right now.
I tried to flash latest version of JetPack in my SD card. So I formatted the SD card and flash into it. After all process is over. I put the SD card into the slot and then started booting.
But there were messages like "Warning : Test Key is used " and " Error : Could not detect network connection ". And then it showed the UEFI Interactive sehll v2.2 to me.
I read the several topics about boot JetPack SDK of Jetson Orin Nano for the first time. There was a solution like connect FC REC and GND with jumper cable. But i do not have a jumper cable. Is there another solution to solve this kind of problem?
I am so grateful to hear your opinions. Thank you.

Hi,

If you want to flash your device, you could do below options:

Thanks