: In software and firmware development, a patch is a set of changes or fixes made to an existing software or firmware. Patching a hex file implies that modifications have been made to update, fix, or enhance the firmware.
A hardware programmer like OCflash (software tool) or a physical PICkit 3/4 if the bootloader is locked. opcom firmware 199 hex file patched
The code is modified to bypass the security checks that would otherwise disable the chip when used with newer software versions. : In software and firmware development, a patch