Just finished flashing my X6M to stage 3. During the first install it popped up so many malfunction codes...got me worried. Then once done, it said to turn on ignition. I turned it on and car was shaking a lot more during idle. I went to install the flash stage 3....once done. Turned on car, seems ok at idle...all the errors on dash went away. Took it for a test drive....seems ok. In S mode i think the car shifted a bit more aggressive....i'll report back when I go for a longer drive tomorrow to swap out my FRM module.
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