Stuck on no service

Stuck on no service

Stuck on no service
Stuck on no service
a week ago
Model: M7200  
Hardware Version: V3
Firmware Version: 3.0.6

My m7200 router suddenly stopped giving me an internet signal 

it just says "no service" I can't get 4g or 3g signal bars at all 

when I turned it on it just flashed two LED indicators the battery and wifi 

what can I do to fix this problem?

 

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