avrdude -c arduino -P com20 -p atmega328p   -Uflash:r:d:\hexfiles\test.hex:i
avrdude -c arduino -P com20 -p atmega328p   -Uflash:r:d:\hexfiles\test.hex:i

avrdude -c arduino -C ../etc/avrdude.conf -P com3 -b 57600 -p atmega328p   -Uflash:r:c:\users\nejat\documents\irqhack64.hex:i

cd "C:\Program Files (x86)\Arduino\hardware\tools\avr\bin"
avrdude -c arduino -C ../etc/avrdude.conf -P com3 -b 57600 -p atmega328p   -Uflash:w:c:\users\nejat\documents\irqhack64.hex:i