During the Orion radio program process you have an option of 'updating' the code file(s) in the radio.
The is all part of the Programmer software application which you use to program the Orion radio.
You will need to obtain the proper (BIZ) flash and (DSP), DSP files from harris, they end with the extension .BIZ for flash and .DSP for the Digital Signal Processor upgrade if required, and they will be something similar to the following; OG30400.BIZ (latest conventional flash) and B4R02A01.DSP (latest DSP code) for example.
When you program the radio you have an option, while in the control head programming screen/page, to select the proper .BIZ and .DSP files that are placed in your radio PROGRAMMER directory.
Mike