re-programming a remote fob, 2001 Fiat Ducato Laika Motorhome?

One of our remote fobs has stopped working it's been in a drawer with no battery in it, the one we are using now is slowly getting unreliable, the one from the drawer won't work now, with a new battery in it flashes it's LED nice and brightly but not a lot else, IE nothing.

Can it be re-programmed or is it not worth it, the remote has no identifying marks except for the Laika emblem, although I do have some close up photos of the circuit board if that would help anyone.

Cheers