I have a firmware from a long discontinued product that I would like to improve on. The firmware is in a .mot file format (SREC from my research) and is uploaded using a tool called M16C asynchronous serial flash loader. From what I can tell the M16C specifies the type of micro controller. I attached the first three lines of the code below to show what the file looks like.
How would I start to go about extracting any useful information from this firmware so it could be modified? I assume it's not possible to go back to the source code that was originally compiled, but what can be accomplished from reverse engineering this? and what tools and software would point me in the right direction?
S0030000FC S2240C0000FEFF0F00FEEF0F00FEDF0F00FEBF0F00FE9F0F00FE7F0F00FEFF0E00FEFF0D00C2 S21C0C0020FEFF0C00FEFF0B00FEFF0A00FEFF0900FEFF0800FEFF000097
Here is a dropbox link to the whole file if needed: https://www.dropbox.com/s/7tues99wdllkzc8/ThrottleControl.mot?dl=0