I have an old digital weighing device that prints the weight using a thermal printer. My goal is to add my logo to the printer's receipt.
There are two boards inside. One is for deriving the display and the loadcell, while another one is for driving the thermal printer (each board has one dsPIC33). Since I do not have the source code of the second board, and only I downloaded the Hex file with PICkit, is there any way to add my logo by modifying the Hex file?