- Build the firmware with `make keymapname`, for example `make default`
- - Run ´<path/to/>teensy_loader_cli --mcu=atmega32u4 -w ergodox_ez_<keymap>.hex´
+ - Run ´<path/to/>teensy_loader_cli -mmcu=atmega32u4 -w ergodox_ez_<keymap>.hex´
- Press the Reset button by inserting a paperclip gently into the reset hole
in the top right corder.