The JB4 turns off the CAN system on map 0 so you should not need to physically disconnect the CAN wires with it. BMWs systems crap out all the time when connecting to cars, perhaps its just something on their end. Maybe have them try to connect/update and if it fails remove CAN wires on the spot to see if that helps.
LOWEST PRICE GURANTEE ON ALL PRODUCTS - www.n54tuning.com - Email; Mike@n54tuning.com
NEW PERFORMANCE LINE N54 DOWNPIPES & M3/M4 & F30 ER DOWNPIPES NOW IN STOCK - ER N54 CHARPE PIPE SPECIALS - NEW JB4 G5 ISO for N54 and F30 N55 ON SALE - NEW S55 M3/M4 JB4 NOW SHIPPING