# YMD75 V4 75% per key RGB hotswap PCB with North Facing LED. * Keyboard Maintainer: [zvecr](https://github.com/zvecr) * Hardware Availability: Make example for this keyboard (after setting up your build environment): make ymdk/ymd75/rev4/iso:default Flashing example for this keyboard: make ymdk/ymd75/rev4/iso:default:flash 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: * **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard * **Physical reset button**: Quickly double tap the button on the back of the PCB * **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available