L322 ,2003 Model starting issues.

Hi
My 2003 L322 model ,M62 BMW powerplant can't crank nor start.I managed to connect the start relay to the positive battery lead via a push button switch.The car started at first .After I turned it off ,I could not manage a restart ,prior to this the ignition key would not to turn leading to me bypassing the steering lock system .Right now I am getting an immobilizer code on diagnostics.Does anyone know how I can reset my immobilizer ECU.

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