E46 320i Japan Spec - Key Problem

[velan]

Hello everyone,I bought a recond 320i Yr 2001/06 with 48K km on it and having minor problem with the spare keys. I got 2 main keys with the lock and unlock button on them and another looks like spare key - no button on it.Out of the 2 main keys, one works fine. The other doesn't work even after changing battery. I tried the method on programming the keys, which I found in the internet, but they don't work. Probably because mine is not the diamond shaped key fob whilst the procedure I found talked about diamond keys.Can someone please let me know how I can DIY without having to go to workshop?Thank you very much for all your thoughts and help.Regards,VelanPuchong