bootloader

https://community.st.com/t5/others-hardware-and-software/stm32f103c8t6-blue-pill-usb-bootloader/td-p/684205 https://medium.com/@paramaggarwal/programming-an-stm32f103-board-using-usb-port-blue-pill-953cec0dbc86 https://www.instructables.com/STM32-Blue-Pill-Progmaming-Via-Arduino-IDE-USB/ https://www.phippselectronics.com/blue-pill-programming-via-usb/?srsltid=AfmBOoqAuVnhwBZ52dmzTWWwSajvHCkdMkiLG3IeeugShTmEABbykOUC https://www.sgbotic.com/index.php?dispatch=pages.view&page_id=48 https://circuitdigest.com/microcontroller-projects/getting-started-with-stm32-blue-pill-development-board-stm32f103c8-using-arduino-ide https://dev.to/shilleh/getting-started-with-stm32-blue-pill-in-arduino-ide-using-a-usb-to-ttl-converter-write-your-first-program-4naj