Peugeot 106 XN - immobiliser - flannel

alright mate, i've changed my code on my immobiliser but as i was doing so the buttons weren't working properly so now i do not know my code. i have tried entering the old code but that doesnt work as i have tried the ignition more than three times. do you know any possible way to overcome this without taking it to a garage to plug into diagnostics? it would be muchly appreciated.