Updating the DC20, DC30, DC40 collar using a Garmin Astro 220
Step 1: Download and Install Garmin Webupdater if you don't already have this on your computer.
Step 2: Connect the 220 to your computer using the USB cable
Step 3: Turn on both the 220 and the collar you want to update
Step 4: Using the 220 Select the Dog you want to update, Press enter.
Step 5: When you are looking at the dog Info Page, (You'll see the Battery and signal strenght bars)
Step 6: Press upgrade Dog Unit
Step 7: Run the Garmin webupdater program on your computer and Follow the Instructions.
Here is a Video Showing how easy it is.