I realize that power over MIDI is not part of the MIDI standard. But...

I recently purchased a bluetooth WIDI dongle (the XVIVE MD1) that plugs into the (5-pin) MIDI port on the back of my keyboard. This dongle expects to be powered by the MIDI port. And given the number of people on Amazon who say it works great, I take it a good number of manufacturers of MIDI controllers do in fact output some power over their MIDI out. However, on my Alesis Q49 keyboard, the dongle does not power up. (I have verified that the dongle CAN power up and connect to Bluetooth, it just won't power up when plugged into the MIDI out on my Q49)

I would have assumed they did this via the unused 1 and 3 pins. But I dismantled my WIDI dongle (in an effort to come up with a way to power it) and was surprised to see that the only connections it has internally are to the usual pins 2, 4, and 5 (and the metal ring).

Upon further reading, it seems pin 4 is usually held at 5V.

In that case, why is my dongle not powering up? Is there perjaps just not enough current available from the Q49 via Pin 4?

Finally, some people allegedly have created an external power supply for the MD1 dongle. But the instructions (formerly on the XVIVE website) have vanished from the internet. Any general tips on how that might be achieved?

Eric