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+[appendix]
+== Updating Device Firmware
+
+	TeleGPS is programmed directly over its USB connectors.
+
+	You may wish to begin by ensuring you have current firmware images.
+	These are distributed as part of the TeleGPS software bundle that
+	also includes the TeleGPS ground station program.  Newer ground
+	station versions typically work fine with older firmware versions,
+	so you don't need to update your devices just to try out new
+	software features.  You can always download the most recent
+	version from http://www.altusmetrum.org/AltOS/
+    
+	=== Updating TeleGPS Firmware
+
+		. Attach a battery and power switch to the target
+		  device. Power up the device.
+
+		. Using a Micro USB cable, connect the target device to
+		  your computer's USB socket.
+
+		. Run TeleGPS, and select 'Flash Device' from the
+		  Device menu.
+
+		. Select the target device in the Device Selection
+		  dialog.
+
+		. Select the image you want to flash to the device,
+		  which should have a name in the form
+		  <product>-v<product-version>-<software-version>.ihx,
+		  such as TeleGPS-v1.0-1.4.0.ihx.
+
+		. Make sure the configuration parameters are reasonable
+		  looking. If the serial number and/or RF configuration
+		  values aren't right, you'll need to change them.
+
+		. Hit the 'OK' button and the software should proceed
+		  to flash the device with new firmware, showing a
+		  progress bar.
+
+		. Verify that the device is working by using the
+		  'Configure Device item to check over the
+		  configuration.