Key fob not working

[Sirspidey]

Hey all strange one, but just had 10 days away and when I got back I had a flat Battery. Kinda new that was going to happen as I left my dash cam on for surveillance while away. So charged up Battery and reconnected an alarm came on. My normal key didn’t switch it if, but the spare did. Spare key will lock and unlock the car and start etc, but my normal key won’t. I just thought it was Battery, so replaced and still nothing. At this point I’m guessing it might need reprogramming, but I have no idea who to do it. It’s an Impreza wrx 2005 and the key is with the single button.

Can anyone help please?

Many thanks

 

 

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