Firmware Flashing Instructions

Select Firmware Type

Please confirm the connection method first

• Not using a CAN tool board: Please select USB firmware.
• When a CAN tool board is needed: Please select USB bridge CAN firmware.
• Gemini V3 has an onboard CAN transceiver chip and does not require an additional external CAN module.
• Only one of the two firmware types can be selected; do not flash both at the same time.

Firmware Type	Applicable Scenario	Advantages	Confirmation Before Selection	Operation
USB firmware	When not using a CAN tool board	Stable communication, simple configuration	When not using a CAN tool board, please use USB firmware	Compile USB firmware
USB bridge CAN firmware	When a CAN tool board is needed	Can connect multiple CAN devices, reducing USB usage	Select only when a CAN tool board is needed; confirm that CAN wiring, termination resistor, and CAN baud rate configurations are consistent	Compile USB bridge CAN firmware

DIP Switch Introduction

• Gemini V3 uses DIP switches to select the connection method between the lower computer and the onboard upper computer or external Type-C port. If the DIP switch position is incorrect, the upper computer will not be able to connect to the lower computer. Please pay close attention!!!

Notice

Please note that the DIP switches must be set to the specified positions for the upper computer to connect properly.

Connecting to the Onboard Upper Computer

• Turn DIP switches 1 and 2 ON to connect the lower computer to the onboard upper computer via the built-in USB.

• Turn DIP switches 3 and 4 OFF; otherwise, the connection between the lower computer and the upper computer will be affected.

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• After setting the DIP switches this way, the lower Type-C port will be occupied by the lower computer. Do not connect other devices to it.

Connecting to an External Upper Computer

• Turn DIP switches 3 and 4 ON to connect the lower computer's USB to the onboard Type-C port.

• Turn DIP switches 1 and 2 OFF; otherwise, the connection between the lower computer and the external upper computer will be affected.

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5-Pin DIP Switch Description

Tip

• The 5-pin DIP switch is used for RRF SBC mode.
• No changes to the 5-pin DIP switch are required when using Klipper.