# Contra Contra is a low cost 40% keyboard. * Keyboard Maintainer: The QMK Community * Hardware Supported: [Contra](https://github.com/ai03-2725/Contra) * Hardware Availability: PCB sold by various vendors Make example for this keyboard (after setting up your build environment): make contra:default See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs). ## Bootloader Enter the bootloader in 3 ways: * **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is configured. * **Physical reset button**: Briefly press the reset button soldered on the PCB. * **Bootmagic reset**: Hold down the top left key and plug in the controller.