If you just plugged it in it is more likely to destroy the adabter board because it shorts both power rails to ground. If you are lucky there were fuses or ocp on the board.
That’s good though, because the power rail would have sent way too much voltage to the oled and the io voltage would have been way too high so it porbably safed the panel.
Still have not made the custom cable.
What kind of more info do you need?