Display “updating firmware, do not shut off power” instead of screen going black

[pschuster]

(May not be possible), in which case, we could give instructions to not turn off screen before update begins.

[pschuster]

MK20 controls the display and RESET signal of display is connected to reset signal of the display. During flashing MK20 the display is turned off. I hacked the board by having a pull up resistor on the display reset signal (its a pull down resistor at the moment) which causes the display to be turned on but just showing a plain white screen which is better.

We could test that again and fix the boards in the next production run.

In the meantime we can add that screen.