See the latest version in the documentation wiki.
This how-to describes the Pirate-Loader console program that uploads new firmware to Bus Pirates with bootloader v4+. Piotr whipped up this easy to use console app with versions for Windows, Linux, and Mac (source). The first release is here, though the latest console app will be included in future firmware upgrade archives.
The ds30 Loader v4 bootloader in the Bus Pirate has a GUI update application that works on Windows (.NET), Linux, and Mac (Mono), but it presents problems on some systems and many users would prefer not to install .net or Mono. If you don’t like the GUI updater, now you can use this simple command line application instead.
A demonstration of the Pirate-Loader update utility follows.
