# ErgoDox EZ The Ez uses the [Teensy Loader](https://www.pjrc.com/teensy/loader.html). Linux users need to modify udev rules as described on the [Teensy Linux page]. Some distributions provide a binary, maybe called `teensy-loader-cli`. [Teensy Linux page]: https://www.pjrc.com/teensy/loader_linux.html To flash the firmware: - Build the firmware with `make <keyboardname>:<keymapname>`, for example `make ergodox_ez:default` - This will result in a hex file called `ergodox_ez_keymapname.hex`, e.g. `ergodox_ez_default.hex` - Start the teensy loader. - Load the .hex file into it. - Press the Reset button by inserting a paperclip gently into the reset hole in the top right corner. - Click the button in the Teensy app to download the firmware. See also [video demonstration](https://www.youtube.com/watch?v=9PyiGUO9_KQ) using Teensy in auto mode. To flash with ´teensy-loader-cli´: - Build the firmware with `make keymapname`, for example `make default` - 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. ## Settings You may want to enable QMK_KEYS_PER_SCAN because the Ergodox has a relatively slow scan rate.