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Before connecting the keyboard to the computer, make sure that the TRRS cable is firmly connected to the connectors on both halves
When connecting the keyboard to the computer, make sure the USB-C cable is firmly inserted into the connector
Never disconnect/connect the TRRS cable when the keyboard is powered
Please refer to the
Download latest firmware
Save your current layout in Vial by clicking on a "File>Save current layout"
Connect the USB cable to the left half of the keyboard and press Layer key and Flash key simultaneously
Wait until controller enter bootloader mode and storage folder will open
Copy or move the Uf2 file and after that the controller should automatically reboot and work as usual
Import back your saved layout for Vial by clicking on a "File>Load saved layout"
Repeat the same installation process for the right half.
Video guide on how to update the firmware (english sub):