Hello
Welcome to the Teltonika Community 
Regarding your query,
If Green and red blinking alternatively ever 500 ms, it means No SIM or bad PIN
also if NO. OF LIT UP LEDs is 0 it means there is no signal ,
It would have been really helpful if there was a ethernet connection to the RUT as it would fasten up the process, If not what we can try is to Reset the router following this
and try to set a static IP for the Wifi Interface with the device IP here
Please revert to us in case the issue persists
Thanks