The chip has been updated to H723 which has a faster refresh rate (up to 550MHZ). We carry this in both configurations that take traditional TMC Divers (e.g. TMC2209) as well as EZ drivers (eg. 2209EZ).

You can download firmware from BTT’s website here: https://github.com/bigtreetech/BIGTREETECH-SKR-3(Klipper firmware here.)