Remove the Old TH Board
Step 1: Loosen the Part Cooling Fan
Unscrew the 3 screws of the part cooling fan, among which the 1 screw on the back is shared with the toolhead rear cover.
After loosening the screws, do not pull the fan; let it hang naturally to avoid damaging the connector.

Step 2: Loosen the Toolhead Rear Cover
Remove the 2 screws on the top of the toolhead rear cover and open the module interface cover.
After opening the interface cover, gently push the toolhead rear cover backward with your fingers from the inner wall.

Step 3: Disconnect All Plugs on the TH Board (Except the Filament Hall Plug and USB-C Plug)
Disconnect the extruder motor plug;
Disconnect the hotend heating assembly plug;
Disconnect the toolhead camera plug;
Tear off the acetate tape on the part cooling fan plug and keep it; you will need to reattach it during installation.
Pinch the base and apply force in the direction perpendicular to the PCB board to disconnect the plugs of part cooling fan and cooling fan for hotend.
Similarly, tear off the tape of the eddy current sensor, keep it, and disconnect the eddy current sensor plug.

Step 4: Unscrew the 3 Screws on the TH Board
Loosen the section of the cable chain nearest to the bracket on the toolhead.
Unscrew the 3 screws on the TH board;

Step 5: Disconnect the Filament Sensor Plug and USB-C Plug
Carefully move the TH board (hold the heat sink with your fingers to prevent it from falling off) to create space to disconnect the filament sensor board plug, then disconnect the plug.
Flip the TH board and slowly wiggle to pull out the USB-C cable;