Check with one of the sponsors near you, they may have the BMW GT-1.
They need to go into the DWA module and clear the alarm fault. The vehicle will start after this.
In some cases you will need to remove the fuse on the DWA module for 15 seconds, reconnect and clear fault then start.
This takes me back to the 90's use to see alot of these at the dealer.
Most dealers are now on the new BMW diagnosis system 3G ISIS, they are still working out some bugs in the system such has communication with the earlier systems.