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Hey,This is very helpful, thank you for the detailed explanation. I do have a question however. I burnt bootloader into my new Atmega328P using my Arduino Uno as the Programmer, which also is used to upload sketch to my new MCU. However, I am unable to upload sketch to the MCU except using the Arduino as the Programmer. Any thoughts? I know my connection is good because I am able to upload sketch to my other MCU using computer.