Hello! Did you get this fixed in the end? Curious as that's the same
thats in my 04 Laguna
.. I'm looking about at the moment for a flash tool and software which supports this
(At a reasonable price - I did find something, but they wanted about £1000 for the software licence). Most of the cheap stuff out there doesn't do the Sagem ones for some reason, there's loads available for the Boche one which is in the diesel version of the same car.
If I have any luck in my search I shall post back...