Hello Please advise if GPIO on Beagle Board is ISOLATED from the +5V USB supply?

There is no +5V supply on the processor. So yes it is isolated and if you connect 5V to a GPIO pin, you will destroy the processor.


I want to provide power supply to BBB using P9-5 and GND pins. Is it possible?
Have you find anything about that?

Yes, you can do that.That is why I put it there. That is what it is for,