Description <br> 25MHZ high speed crystal oscillator 32.768Khz 6PF low speed crystal oscillator <br> V3.0 version began to use lead-free process, the pin header is gold-plated pin header, more environmentally friendly <br> Flash pads have been reserved and USBDisk FATFFS routines are provided <br> WeAct HID FW Bootloader has been burned out of the factory. It is a special factory test version, and hex is not provided. <br> Support MicroPython programming, provide available MicroPython firmware, see for configuration files, but do not provide technical answers! <br> <br> Boards with version V1.3 and above have 3 buttons, reset button, BOOT0 button, and user buttons. <br> How to enter ISP mode <br> 1: Press and hold the BOOT0 button and the reset button under the power-on state, then release the reset button, and release the BOOT0 button after 0.5 seconds <br> 2: Hold down the BOOT0 key when power is off, and release the BOOT0 key 0.5S after power on <br> DFU mode: just use the data cable to connect to the computer, if there is a problem of unrecognized, you can properly heat the chip (25 Celsius), and then re-enter the ISP mode <br> Serial port mode: use USB to serial port to connect PA9 and PA10 of the core board <br> WeAct HID FW Bootloader <br> No need for USB to serial port, no debugger, no computer driver, just a TYPE-C data cable to complete the firmware download <br> Press and hold theKEY button, click thereset button, LED C13flashes, release theKEY buttonto enter <br> model:STM32F411CEU6 <br> Colour:black <br> Material:plastic <br> <br> Package Contents: <br> 1 * Development Board <br> <br> Only the above package content, other are not included. <br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm. <br>