Quote:
Originally Posted by Blackcross
At least in the past, this would not happen: the dealers (if doing an update) overwrote everything that was there.
So if you had a tune, then the manufacturer fixed a recall (as an example), updated your ECU (and they do NOT ask you if you take the car in - if the books say an ECU update is necessary they do it), your tune would be over written.
You then need to send it back and get the tune either reinstalled and thus loosing the recall fix (or whatever reason the manufacturer felt they needed new software in the car). Or you wait for the tuner to come out with a new version that has the fix in it, then send it in.
I don't know GSR, but ECU tuners usually don;t have a problem keeping you up to date. So all great news from GSR and I'm keen to keep an eye on M235i progress.
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I just wanted to clarify comments made above. ECU updates do come from BMW but most of the time they are updating only portions of the binary - not all code in the entire ECU. To your point there are special circumstances that a very broad ECU update could potentially overwrite some or all of the code we have changed. In those cases we would absolutely reflash the ECU.
An important point about reflashing is that we are only updating the binary we need to so we would NOT copy over the changes that BMW made to fix other issues.