Other fob hasn't had battery in for months, I've tried over two days and hasn't worked, any magical ignition on press some key fob buttons and hey presto?

Anyone? Please help!

Hi, this is my first post on behalf of my girlfriends freelander 1 W reg. i dont beleive the battery was flat in the fob. however all doors are locked and will not unlock with the fob, the driver door will obviously open with the key. the light on the dash blinks red until i try to turn the key...