1. THE60 json file under kbfirmware. (visiting kbfirmware.com)
2. THE60 QMK configurator. (Notice: limited layouts supported)
Credit: Erovia (Github link)
4. THE60 Plate CAD File
5. About Reset
Beside the reset button under the PCB, you can use the default reset combination key of pressing tab and top right key at the same time. (The latest firmware I used to test the PCB has that combination. But if that doesn't work, it may be not using the latest testing firmware. )
And remember to add reset key in your firmware.