In the absence of a manual available online I am not sure what the required capabilities would be. A very lightweight option is to use mass storage. If the file

In the absence of a manual available online I am not sure what the required capabilities would be. A very lightweight option is to use mass storage. If the file system (like some sort of flash-friendly FS) can't be block-accessed by common OSes there are some emulation workarounds (e.g. mbed on STM32 boards emulates FAT even though it's just a flashing tool) But otherwise if there's going to be a commandline Linux tool, that's most bang for a buck. Others can build upon it.