Stop is at "Determing the IP address of target".

Stop is at “Determing the IP address of target”.I will update jetson TX1 jetpack 3.0 to jetpack 3.1

the info is below:
Finish Flashing OS
Determing the IP address of target…

How can fix this?

You could manually enter the IP address. Is the router an appliance, or is it the host? One of them will have a log of the Jetson requesting an address as it boots. The mechanism for doing this automatically works only with wired ethernet, so if you are using WiFi between the Jetson and host this would be one reason why you’d get a failure.