replace the gl1800 ecm with hiss

imported post

i have a 2003 goldwing 1800,this motorcycle cannot idle and the f1 blink 25 that mean the knock sensor or the ecm.I change the knock sensor but my gl1800 still cannot idle and the other say that i have a broken ecm.I change the ecm with the new one but my motor cannot start and other says i must syncronized my ignition key chip with the ecm cos i have hiss on my gl1800,could anybody teach how to solve this problem? cos in my area we don't have the authorized dealer to solve this problem,maybe some little trick to make the ecm can recognized the chip on the ignition key?