Hi all - still fire fighting my engine running lean changed all the obvious no leaks with a smoke test and there are no particular cylinders causing issues.

After extensive searching on here some members claim a firmware update of the engine ecu has fixed such issues. Anyone know of this? If so does anyone know what kind of money Land Rover would charge or if a good Indy could do it? From Cambridge if anyone can give pointer and its a 2007 Current stable:
2006 BMW M6
2007 4.2 V8 S/C FF
Gone:
2002 4.4 V8 FF