I don't know if this helps:
I noticed that a new release of avrdude, was released just one month after ver. 5.11 called 5.11.1
So maybe there was a bug in 5.11 ?
http://download.savannah.gnu.org/releases/avrdude/
More about ver. 5.11 problems
I don't know if this helps:
I noticed that a new release of avrdude, was released just one month after ver. 5.11 called 5.11.1
So maybe there was a bug in 5.11 ?
http://download.savannah.gnu.org/releases/avrdude/
More about ver. 5.11 problems