Hi I know how to downlaod Bootloader to Atmega644P with USBTiny & Sanguino. I know how to generate HEX file from sketch, copy & paste and download to 644P with USBTiny. (I don't need bootloader) But it is long process. It must be a short cut way to download Arduino's sketch to chip with programmer directly. I search for it and not successful. Appreciate it if someone show me how to do it.