How to Flash a Firmware to USB-C Controller
Getting the Hardware

USB-C controller
Wire or Tweezer
USB-C cable for connecting to computer
Steps
Download and install QMK toolbox
QMK ToolBox: https://github.com/qmk/qmk_toolbox
Enter DFU (Bootloader) Mode
Connect the USB-C controller to the computer
Use the wire or tweezer to bridge the GND and RESET pin

After entering bootloader mode, the following message will be displayed in QMK Tool. You can start flashing the firmware to the controller.

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