qmk_firmware/quantum/tools
..
README.md
eeprom_reset.hex

README.md

eeprom_reset.hex is to reset the eeprom on the Atmega32u4, like this:

dfu-programmer atmega32u4 erase
dfu-programmer atmega32u4 flash --eeprom eeprom_reset.hex

You'll need to reflash afterwards, because DFU requires the flash to be erased before messing with the eeprom.