-From the top level `qmk_firmware` directory run `make KEYBOARD-SUBPROJECT-KEYMAP-avrdude` for automatic serial port resolution and flashing.
-Example: `make lets_split-rev2-default-avrdude`
+From the top level `qmk_firmware` directory run `make KEYBOARD:KEYMAP:avrdude` for automatic serial port resolution and flashing.
+Example: `make lets_split/rev2:default:avrdude`