Support Page for TK40X
![](https://lazydesigners.cn/wp-content/uploads/2024/05/Sera.142.jpg)
Use vial software to put the PCB into DFU mode. (Recommended)
Or short the two pads of ‘reset’ on the PCB with tweezers while pressing the ‘boot’ button.
Ignore the MCU selection in the QMK Toolbox. You just need to choose the bin file(firmware file) and press ‘Flash’.