I wrote somewhere in this forum that I'd strange problem while uploading: first upload after rebooting the mac was ok and then only perp. bootloader possible, hangs (touchpad freezed for a second) and other strange problems.
Now I know what the problem was: An old FTDI driver was lurking in OSX/System/Library/extensions (dated 2012).
I don't know what happened (I tried many things out in history...).
Interesting point: There is also an extensions folder under: OSX/library/extensions. The new kext was located there! (dated 2.3.2015)
So if anybody have got the same problem ---> look for an outdated driver!
Apple Mac OSX
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