So I bought one of the ebay specials too got it cut took it to the dealer and they told me the chip inside was out of a 5 series and that they cannot reprogram it to start the ignition just unlock the doors as others have mentioned. The issue I'm having is not a battery I just bought the truck used only came with one key. So I was reading the other post and I just wanna get this right bottom line if you don't buy the key from the dealer there is no way to get it to start the ignition, correct?