1、fluidd installation and uninstallation
2、mainsail installation and uninstallation
3、pin out
4、root guide
firmware-recovery-tool: https://github.com/CrealityOfficial/K1_Series_Annex/releases/tag/V1.0.0
release： https://github.com/CrealityOfficial/K1_Series_Klipper/releases/tag/V1.3.2.1