Two Trees Sapphire Pro Firmware Upd Review

Test homing immediately. If it moves away from endstops, invert the direction flags:

$23=1   (invert homing direction)

Older Sapphire Pro models with an ATmega328P (similar to Arduino Uno) need a classic GRBL upload. two trees sapphire pro firmware upd

Cause: Servo pin mapping wrong or firmware set to BLTOUCH without correct pin.
Fix: In pins_MKS_ROBIN_NANO_V2.h, ensure SERVO0_PIN is set to PC6 or PB0 depending on wiring. Or simply enable BLTOUCH and Z_MIN_PROBE_USES_Z_MIN_ENDSTOP_PIN. Test homing immediately