Thank you very much, but:
I downloaded WinAVR, type 'avrdude -p m8 -P com4 -c avrisp -b 19200' in C:\WinAVR-20100110\bin directory, and result is:
avrdude.exe: stk500_program_enable(): protocol error, expect=0x14, resp=0x50
avrdude.exe: initialization failed, rc=-1
- Double check connections and try again, or use -F to override*
- this check.*
avrdude.exe: stk500_disable(): protocol error, expect=0x14, resp=0x51
I downloaded avrdude-5.11-Patch7610-win32, but the result is the same.
The problem could be the bootloader?
Enrico.