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Apple forced to ditch iPhone lightning charger
(www.bbc.com)
This is a most excellent place for technology news and articles.
The base 15 has the processor from the 14 pro, which does not have the USB 3.0 controller on it.
Just like the base 14 had the processor from the 13 pro ...and the base 13 had the processor from the 12 pro
you get the idea.