Hmm....I wonder what is involved w/ swapping out the TCU to the newer, post 4/08 TCU. If nothing else, this would eliminate one possibility.
I am off to put my -311 controller in my 2009 335xi to see if it works in that vehicle. Will post back soon.
12 E70 X5d Black Saphire/ Tobacco
08 E92 M3 SG/Fox Red Gintani Race, RG63
09 E90 335xi Crimson/Saddle 02 E46 M3 Cab Imola/Black (Sold-RIP
)97 E36 Z3 1.9 Atlanta Blue/Tan (Sold)