The Fly-Gemini-V1 has been replaced by the Fly-Gemini-V1.1 https://github.com/Mellow-3D/Fly-Gemini-V1.1
RRF information can be found here https://teamgloomy.github.io/fly_gemini_general.html
Klipper information can be found here https://mellow.klipper.cn/#/board/fly_gemini_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