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Does your battery charger have a supply mode and does it output a constant 25 amps or more. If not, I’d suggest something like the Ctek mxs 25 charger.
Did you buy your cable from BimmerGeeks or Twisted Tuning. If not, buy one as they are guaranteed to work as opposed to the random chance you take with eBay cables.
Make sure your phone is in FlightMode.
Take a deep breath and go through it step by step.
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