Hi Pedro!
I am using Windows 7 Ultimate (64 bits).
I tried with both USB 2.0 and 3.0 ports and got the same error.
I did re-download Arduino IDE twice and got the same error.
I tried on a different PC and got the same error.
As mentioned in the previous post I get instantly a java.lang.NullPointerExceptio when I try to update the firmware.
For the presence of special characters in the directory/file names I checked few hundreds directory/file names visually (and found none) but rapidly figured out that there must be 10 - 20K directory/file names and I gave up.
Same problem with the length of the paths. There are hundreds directories...
This is just unfeasible!
Can you be more specific?
What's the maximum length allowed for a path?
What are the paths used for updating the firmware?
What are the files used for updating the firmware?
Regards,
Arnold