This step is a prerequisite step, just to check if you are able to build anything at all, solve any problems early on before you get too far ahead. You might have done this before, so skip it if you want.

You should have already be able to use your Netduino already. Which means you have already downloaded and installed everything from . The most important (for this tutorial) tool inside is MFDeploy.exe, which is found in "Microsoft .NET Micro Framework\v4.2\Tools". (alternatively, you can get MFDeploy from directly)

Then you need to follow this guide first: , but after the build finishes with no errors, you do not need to generate the DFU file.

(note: this is extremely time consuming, the downloads are huge, the installations are huge, the compile time takes 5 minutes on a high end computer, and the error messages might be confusing to the beginner. I don't mind if you skip these steps and just flash my precompiled firmware instead)

If you were able to complete this, there will be a folder that looks like portingkit\BuildOutput\THUMB2\GCC4.6\le\FLASH\release\NetduinoPlus2\bin\tinyclr.hex, and inside there will be some files (we need ER_CONFIG and ER_FLASH). Plug in your Netduino, and run MFDeploy.exe . See the screenshots below for the next steps.
I've provided the firmware image files ER_CONFIG and ER_FLASH, plus all the DLL files you need. They are all in the download page. But the DLLs will not work unless you use MFDeploy to update the firmware first.
After clicking "Deploy", the firmware on your Netduino will be updated. Remember how to do this, because you'll be doing this a lot if you are constantly testing custom firmware.

This guide was first published on Sep 12, 2013. It was last updated on Sep 12, 2013.

This page (Building Firmware) was last updated on Sep 05, 2013.

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