@Alan you might want to change the wording on that site, as it is worded in a confusing way, which is why @Dodias installed the wrong firmware. Instead of saying, “Please read this article before you upgrade the firmware to V1.12.0.”, you might want to say something like:
If you are upgrading from a version of firmware prior to v1.12.0, please follow the directions in the following article and use the latest version of firmware in place of v1.12.0 while following them: