Press and hold the C5/C4/C4L OK button, the HID interface is connected to the computer to enter the firmware upgrade mode (the screen displays DFU mode, and the button can be released after the screen is displayed)
Connection method: Use the USB-A to USB-C data cable or adapter to connect the HID interface on the side of the C4/C4L to upgrade
The software only supports windows system
It is recommended to use the native USB port on the back of the motherboard. It is reliable to directly connect to the native USB2.0 port of the motherboard. Extension cables, hubs, and some extension 3.0 ports may be abnormal.
Friendly reminder: Some data cables or adapters cannot be connected without D+D- inside.



C5/C4/C4L*Original firmware
