I think you maybe have not read the whole thread to have the whole picture of where we stand. Recompiling the 2.5 APP with gcc and running it with the closed-source binary 2.5 LIB does not work (yet). I am not sure I want to spend time on getting it to work either, since I consider a closed-source library a dead end. To see that we can do the whole build with gcc, I would rather try the 1.1 sources, where everything is open-source and should be easier to have working. But living in the hope that we would soon see an open-source 3.02 version or so, I haven’t looked much at the old code. Anyway, there has been enough to do with dfu-util and dfuse, which is a prerequisite for me working on this on Linux.