Hello, i was driving with my car fiat bravo 1.6 2010 and airbag red light, yellow light and seatbelt turned on. I sent to office to fix it. The guy tried too many files but no working. Ecu voltage is ok. Files he is writing are not working 3-4 files. Does anyone how to fix, in case to not buy another used airbag ecu because there is no guarantee buying online used products