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.