Arduino for STM32

if it blinks fast, then blinks slow, congrats you *may* have installed the bootloader. the next thing is to run dfu-util -l if you don't get any dfu devices listed, maybe it isn't roger's bootloader In my case, it blinks fast and then suddenly turn off the LED. I don't get any dfu device as well!

Hey guys, I'm using a bluepill and I want to use Roger's bootloader because it's convenient. I am attempting to burn the bootloader to the bluepill thru FTDI but it can't connect to the bluepill, the error is "can't init...". When using st-link to upload my code, it blinks fast for about 2...