The Fly-CDY has been replaced by the Fly-CDYv2 https://github.com/Mellow-3D/Fly-CDYv2
RRF information can be found here https://teamgloomy.github.io/fly_cdy_general.html
Klipper information can be found here https://mellow.klipper.cn/#/board/fly_cdy_v1/
For Klipper support please join this Discord Channel https://discord.gg/zAung88zbK
For RRF support please join this Discord Channel https://discord.gg/uS97Qs7