Firmware Flashing Instructions

Host Connection Instructions

Core Connection Limitation

The Fly-D8 mainboard can only communicate with the host for Klipper via the Type-C USB interface.

Connection Requirements:

Use a high-quality Type-C data cable to ensure stable data transmission.
It is recommended to avoid using excessively long data cables (not exceeding 1.5 meters).
Connect to a standard USB-A port on the host.

🔧 Firmware Selection Rules

Please select the correct firmware according to your connection method and toolboard type, following these rules:

Configuration Scenario	Mainboard Firmware	Toolboard Firmware	Key Notes
Not using a toolboard (Direct USB connection)	`USB Firmware`	—	The most common configuration, suitable for most single-extruder printers.
Using a CAN toolboard	`CAN Bridge Firmware`	`CAN Firmware`	Communication via CAN bus. Please note: The mainboard must be flashed with CAN bridge firmware; otherwise, a USB-to-CAN adapter (e.g., UTOC) is required.
Using an RS232 toolboard	`USB Firmware`	`RS232 Firmware`	Connect to the toolboard via serial port; the mainboard still uses USB firmware.