Firmware cube orange+

Hello everyone. I am a person who is just starting my knowledge in the world of drones. I just bought a pixhawk cube orange+, can you guys recommend the best firmware for the copter I have? because I heard some bugs in the previous firmware.

thank you very much for your help

Latest stable Ardupilot firmware.
Dont try to downgrade the firmware or use older versions since there can be important fixes.