Restore Chatter's firmware
Once you're done coding and just want your Chatter to be "normal" again, you need to restore his base firmware.
This is quite simple, just connect your Chatter to the USB port of your computer and press the "Restore firmware" button on the top right.
You will be prompted with a window to choose the device you are restoring the firmware for.
Choose Chatter, of course.
Wait for a few seconds, and your Chatter will be back and running like usual.
You need to do this whenever you're done coding your Chatter if you want him to revert to his initial out-of-the-box functionality.