No Service! - Xiaomi Mi 2

hi,
my mi2s' imei changed by a technician to a new one but i got "no service" error..
phone recognising sim card, asking and accepting pin code but then no connection to the service.
cheked the "service state";
voice and data radios seems "off".
flashed the rom via fastboot but no luck..
what should i do, anyone knows?
thanks in advance..

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