it is easyer to have a working pc se tool lite is ur best bet to flash a phone if u have had a replacent pcb be very cafull as it maybe that the nice phone man just patch ur imei to get it working again so if u do reflash it this will remove the patch from the imei in all fairness would be easyer to pop it back to him and say can u put gerninc firm were on it would save u a load off time and running back and forward to the library