Originally Posted by Dundas
My May 08 build E92 is due for routine service which the dealer tells me includes a software update. Can I leave the new controller in or do I need to put the original controller back in for the software update?
As stated before in the thread, remove new controller and re-install "old" controller before a software update. This way there will be no issues with the update process giving out error codes for "unknown" parts.