SPEEDFIGHT IMMOBILSER?

HAVING BOUGHT A NEW BATTERY,AND CHARGED IT UP.WHEN CONNECTED TO THE BIKE,THE IMMOBILISER FLASHES AS IT SHOULD,AND ONCE IVE PUT THE KEY IN IT GOES SOLID 4 A SECOND AND THEN GOES OUT AS IT SHOULD ALLOWING ME TO START THE BIKE.AFTER A NUMBER OF ATTEMPTS IT WILL EVENTUALLY NOT DEACTIVATE AND CARRY ON FLASHING.WHAT IS THE PROBLEM,DO I HAVE TO BYPASS THE IMMOBILISER OR IS THERE A CHEAPER AND EASIER WAY.