Posted on May 17, 2011 at 12:46Oh.. As I described, I was using DfuSe Demo and DFU Tester tools and USB connection only. I hadn't means to use JTAG or serial connection. Anyway, the board stopped to appear as a ''STM Device in DFU mode'' to host PC ...

Posted on May 17, 2011 at 12:46Thanks for the answer. I see now that this was exactly the problem.. :D Kind regards, Mika

Posted on May 17, 2011 at 12:46In short, the problem is that the board doesn’t go into DFU mode (anymore). I have STM3210E-EVAL board. I reset the board by pressing the Key-button so that it went to DFU mode and I was able to use DfuSe Demo (v2.2)...