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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Flashing back to stock ECU code



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      04-10-2009, 12:05 PM   #1
akira42
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Flashing back to stock ECU code

How does BMW tell that you've flashed back to stock code. I'm assuming they use some kind of checksum. Anybody know?
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      04-10-2009, 12:10 PM   #2
RambleJ
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Flashed back to normal from what? Dinan?
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      04-10-2009, 12:20 PM   #3
akira42
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Yea, or any flash tune. I'm just curious.
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      04-10-2009, 01:56 PM   #4
RambleJ
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Well if its going back to stock from a Dinan, BMW already has on file that you have had the Dinan flash on your car and your car cannot be CPO'd, I am not too sure about any other ECU flashes though..
Maybe someone who has a flash can jump in.......
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      04-10-2009, 02:17 PM   #5
akira42
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I thought that even though you flash it back, their still able to tell. I was hoping to get a little info on this.
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      04-10-2009, 02:19 PM   #6
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You could ask Jim.

He's in the other thread lol.
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