How to work with SD card partition?

[Flavor]

Here's what I'd recommend. This is likely to be the easiest way to do it, but there are other ways (like SSH) that I'd probably do it if it were me.

1) Connect a USB keyboard to your Freeplay CM3. If you can also connect HDMI, it will likely be much easier. It's hard to see the text console on the LCD.
2) Boot the Freeplay CM3.
3) At the main menu, hit F4 on the keyboard.
4) type this command
sudo nano /etc/modprobe.d/mk_arcade_joystick.conf
5) There should be exactly ONE line that doesn't start with a #. Find it, and edit one part of it.
CHANGE
gpio=4,17,6,5,19,26,16,24,23,18,15,14,-20,-1,-1,-1,-1,-1,-1,-1,-1
TO
gpio=4,17,6,5,19,26,16,24,23,18,15,14,-20,42,43,-1,41,-1,-1,-1,-1
6) Hit CTRL+X and hit Y and then ENTER to exit and save the file
7) Type this command to shut down the Freeplay CM3
sudo reboot
8) Boot the Freeplay CM3
9) At the main menu, hit START and then CONFIGURE INPUTS. Run through all the inputs. At the end, it will ask for the HOTKEY. Tap/Release the power button TWICE.