All of out modules has a modified version of a Microchip CAN bootloader installed. This bootloader can be found here. Normally you don't have to write it to your module and can use VSCP Works to update firmware of your module. If for some reason it is missing or broken it is made available here so that you can fix your module. Note that you must have a pic programmer such as pckit2/3 or similar to write the bootloader to your board. Instructions is in the README file of the bootloader folder.