Jetson Nano Orin does not respond after reboot

I see… Could I try to flash the board with SDK maganer? Will it solve the problem? Since Test key warnning is keeping showning every time during the boot, and I use mmc card to reload the image, it still doesn’t work. I saw your suugetion in this post: Jetson AGX Orin shows Test key warning when booting - #20 by WayneWWW
I’ll try to see if this solve the problem.