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Typically, a flash of the engine computer or other electronix is done to prevent a very rare problem. I picked up my 2018 M240i in mid-September 2017. I had to have the gauge cluster reflashed because on a very rare occasion the cluster would stop working for a few owners. I never experienced an issue. Took 2.5 hours to reflash the cluster!! They reflashed the DME during the 2 year check up. Again, it was for a very rare condition that I never experienced. Luckily, my dealer has a great latte machine!
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