There's a guy on ebay offering an EWS delete service.....
http://www.ebay.co.uk/itm/BMW-MS41-E...item2323265532
I have no experience or knowledge of this guy but it may be a useful option for those tackling the more complex BMW immobiliser function in some later M52/M54 engines. Read the small print becuase it only applies to certain types of DME's.
...peter