Some users reported that the Mercedes Benz MB Fast adapter for Xhorse VVDI Key Tool Plus feeds it 12V but does not output 12 volts. The device and adapter are new.
Here is the clue.
It’s not gonna output 12v just by plugging in an external 12v power source.
It doesn’t show 12 until you start process. It gives warning but just hit continue and then the 12 volts will show on top right.
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