Arduino for STM32

hi, i've used STM32duino to flash my STM32F103RCT6 board,but recently i've found a very strange bug. when i connect my device to computer,generily,it will immenedity show a device called "stm32duino bootloader",and after a short time,connect as a device(i flash a QMK keyboard code in it), ...

Thanks!
turns out,this board did't default connect BOOT0 to GND.

hi, recently i've bought some RCT6 Boards, i'm trying to write stm32duino in it,but i've meet a strange things; when i plug the board, system stucked in "STM32duino Bootloader",when i download a firmware, e.g. qmk, and press "reset key",it will function normally, however,when i r...

hi,i bought a STM32F103RCT6 Developed board. https://user-images.githubusercontent.com/28498352/204120922-f575443e-d83e-400b-b198-0ee63823f628.jpg this board don't have any led or board-key except NRST, so,which kind of bootloader should i use? can i use generic_boot20_pc13.bin(as same as blue piils...