When moving between new releases like .NET Micro Framework 4.1 and .NET Micro Framework 4.2, you should update the Netduino’s bootloader as well.
To do so, use Atmel’s “SAM-BA CDC” software (current version is 2.11). If you don’t already have a copy, download it now.
At the time of writing, this tool can be found at http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3759. Up-to-date information on reflashing Netduino can be found in the Netduino community at http://wiki.netduino.com.
To reflash the bootloader, you need to erase everything from the Netduino’s microcontroller flash memory. To do so, make sure your Netduino is powered up, then connect a wire between the 3.3V header on the Netduino and the small gold square directly below digital pin D0 as shown in Figure A-3. Applying power to this pad for half a second will erase the Netduino’s firmware.
Figure A-3. Applying 3.3V power to the erase pad
Now, unplug and reconnect your Netduino. Windows should detect a new serial port, which is a virtual serial port that will enable you to update the bootloader.
Now start the SAM-BA CDC tool (Figure A-4). Select the COM port assigned to your Netduino and select a board type of at91sam7x512-ek. Press Connect.
Figure A-4. Connecting to Netduino
If there are multiple COM ...