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I always have a doubt that how do firmware engineers dump code into a quad flat microcontroller? For a starter kit there is already connection like USB or some SPI ,I2C headers to burn the code,also starter kits are very costly. I know that for Dual inline Package there are some cheap programmers in the market.Then what about quad flat micros used in industrial application?How do you all proceed?My question is based on a hobbyist or a small firmware engineer point of view.