MK808 Serial Console Mod 
01. The original MK808...

02. A first look inside

03. Remove the heatsink carefully around the edges

04. The pins used to add the serial console

05. GND (blue) and RX (green) pins connected

06. All pins connected. GND (blue) RX (Green) TX (Yellow)

07. Putting things back together

08. The connector on the outside

10. The hardware mod end result