Full tutorial to flash Betaflight 4.2, RPM Filter, bi-directional DSHOT ESC firmware, full PID tune - YouTube
How to Setup RPM Filter / Bi-Directional DShot in Betaflight - Oscar Liang
I cant get RPM filters to work with my BLheli_S escs.... : r/Multicopter
I flashed my tinyhawk 2 to betaflight 4.1 last night and flashed the esc to jesc to get rpm filters. It felt really odd afterwards but I was getting almost an extra