This tutorial will walk you through how to upgrade your Mojo's bootloader to the new Arduino compatible bootloader. To do this you will need an ISP programmer. We recommend the AVRISP mkII, but any ISP programmer should work. You can even use an Arduino to program the Mojo if you have one.
On the Mojo there is a microcontroller that provides most of the core functionality. As we improve the firmware for the microcontroller by fixing bugs and adding new features, you can update the Mojo by following this tutorial. The microcontroller has a USB bootloader so it is easy to update yourself.