"From what I have seen this morning doing some experimentation, do not update any 2007/2008 E38's to a 2009 OS using TIS, you are going to end up with a messed up ECM.
I have performed multiple flashes of 2007 OS's without a hitch, as soon as TIS programmed in OS 12628982 I lost all the ECM info and it was locked."



once that happened were you able to flash back in an 07 OS?