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X3 won't start after ring to give a boost

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My fiance is calling and tried to boost a friend's car. I don't think they did it right because the other car did not start and her x3 have a warning saying something along the lines of "ignition error. Do not turn off engine. Engine may not be able to restart", but the engine want actually on at the time. When they unhooked the cables and tried to start the engine it wouldn't stay and gave a warning saying "ignition on". Is they're anything that can be done or dies it need to be taken in to s mechanic?
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