No Network signal in Nexus 5x

Please Help !!!
Need help from experts.
there is a network error in my Nexus 5x.
i went to testing mode on my N5x by using this code *#*#4636#*#*
and saw lots of things.
i went to the phone info option
and curiously i clicked on the "select radio band"
and pressed on the "USA Band".
after that all signals and network service is completely gone from my device.
its just showing me my operator name and "Emergency calls only" bt no signals.
same SIM is working perfectly on other device.
i tried...

No Network signal in Nexus 5x

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