Fourtrak, F78, N reg, immobiliser fault

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wondering if anyone can give an idea on why my immobiliser will not cancel to allow me to start vehicle. I have just replaced the battery on the vehicle so maybe there is a sequence to reset the immobiliser - genuine Daihatsu immobiliser fitted (small black plastic fob with three electrical pegs). Or failing this is the immobiliser easy to bypass? thanks.............