6. [MKII RGB V2*](mkiirgb/v3/): Released in March 2021. Atmega32u4 hotswap board. ESD Protected. Uses LUFA bootloader and different inswitch RGB implementation. No visible markings differentiating it from the previous V2.
**Firmware files are SPECIFIC to each board. Firmware files from one, will not work on the other.** Please use the `.hex` or `.bin` appropriate for your board.
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).