BestPig released a new version of freeBOOT ToolBox - a tool that allows to create and customize a freeBOOT image based on an original or XBR/freeBOOT dump.

What's new/fixed:
* Added support for the 13599 kernel thanks to fbBuild 0.32
* Removed hashcheck (WARNING! this is experimental, try it ONLY if you have a JTAG cable)

Official Site-