Hi,
I know you may not be happy with this. This error requires debug.
I had same issue reported last week but the issue was resolved with a method that makes no sense.
Please put your jetson orin nano into recovery mode first and share me the result of lsusb on your host.
Run this command on your host
echo 8 > /proc/sys/kernel/printk
echo 'module usbcore +p' > /sys/kernel/debug/dynamic_debug/control
echo 'module xhci_hcd +p' > /sys/kernel/debug/dynamic_debug/control
And dump dmesg first.
Then, start the flash again and see if dmesg on host prints anything new.
Also, share me the full flash log.