Great tutorial for the S1 Pro. Worked great on my STM32F401. Thanks to 3DPrintBeginner. So nice to get rid of the SD card and enjoy tons more features with Klipper. I was lucky to have a Pi4b I bought a year ago. One tip I have for those installing Klipper is to uninstall the Arc_Welder plugin in Cura if they have it installed. The G2 and G3 codes it yields do not work in Klipper without making changes.
Oh… One more thing. The Klipper firmware did not flash on the first try. But did flash fine on the second try. Weird!