# XD84 Pro Development docs covering the following: - ATmega32u4 - RGB - Backlight - Light Through Cat ### Bootloader Default bootloader is `atmel-dfu`. Reboot to bootloader via bridging 2 contacts points in the icsp header. Flash using regular dfu methods. # RGB - PIN F6 - Number of RGB LED: 12 # Backlight - PIN F5 # Light Through Cat - PIN F5 # Caps Lock LED/Indicator - PIN B2 ## Return to stock firmware The original TMK firmware is available at [xd.tkg.io](https://xd.tkg.io).