hoangya
http://dan.drown.org/stm32duino/package_STM32duino_index.json
thêm link này vào chưa? File > Preferences
Và làm đủ hết các bước này
Link Below for the STM32 Bootloader and Arduino Core
(you may have to install the Arduino Due core also for the compiler.)
https://github.com/rogerclarkmelbourne/Arduino_STM32/wiki/Installation
https://github.com/rogerclarkmelbourne/Arduino_STM32
Bootloader:
https://github.com/rogerclarkmelbourne/STM32duino-bootloader/tree/master/binaries
BluePill_generic_boot20_pc13.bin (On the "Bluepill" bootloader "_pc13" refers to the LED pin. )
Important Upload Note:
-----------------------
If your "upload method" is STLink you will loose the ability to upload using the "STMduino Bootloader".
To use the STMduino Bootloader again, you will need to reflash the bootloader using a UART adaptor.
Blue pill bị lỗi usb nên phải flash lại bootloader:), khuyên bác là k nên theo bluepill nữa nhé, nó cũng không được tác giả support nữa r