It's sometimes tricky to find the right timing. Try pressing the left button for 10 seconds, then press the right button until it changes into Engineering Mode. Or 7 seconds. It's something between 5 and 10 seconds and it always works (at least with US sw up to 0110 and Euro sw up to 0360).
Cant access Engineering mode
So i have a euro a6 unit retrofitted into my 2000 S4 and it has been loaded with US firmware like many others. Is there a common problem with getting into it with these?
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Doesn't matter. The only thing I found was that it seems to be more difficult once you left Engineering Mode and try it again. Seems to be easier to do it after the initial power on. But that might be me.
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