At the moment there is no ECU tuning solution for the F series diesel BMW's. They're running a new protocol which effectively damages the ECU when you try to flash to it. We've successfully obtained ECU software read's from them, but writing back to it is still a bit hit and miss.
Some tuners in Europe are telling us they've managed with a success rate of 50% (which is not a risk I would want to take on my own or a customers car).
We can get hold of some better tuning boxes than the ones in the thread above if you absolutely want one. They're manufactured by DIM Sport (one of the better names in the business). You're looking at around EUR 500 inc delivery, but drop me an email if you want a formal price.
I haven't tried one myself yet as I'd rather wait until we've perfected the ECU remap solution.
info@premiertuning.com