** obligatory "your warranty in now void" disclaimer **
THIS GUIDE IS FOR CHITU V6 BOARDS ONLY
So, you've decided to upgrade you printer software-wise. You are in for a ride!
You'll get Klipper experience. That includes speeds up to 300 mm/s (I've tested infill at 180, and it was pretty much flawless), proper linear advance, low vibration on high accelerations without relying on approximations like S-Curve, no lags on dense GCode files — it's nothing like Marlin or the stock firmware.