Thank you. I have solve the problem, and it can work fine in V17.0 and V18.0. I found V17.0 and V18.0 are different from V15.0. In V15.0, my boatloader code can wait after clicking the 'connect' button, but in V17.0 and V18.0 the code didn't. Thus, I...

hi, I got the same problem. I have tryed V16.0, V17.0 and V18.0, but they can't work. Could you please share how did you fix it? Thank you.

No, I got the same problem. And I have test V2.17.0 and V2.18.0, but they don't work. I can still use V2.15.0.