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Resolve the common 'avrdude: stk500_getsync()' error on Arduino Uno boards. This guide covers port conflicts, RX/TX interference, driver issues, and hardware loopback testing.
When working with Arduino boards, updating the bootloader or sketch firmware can introduce incompatibilities or unexpected behavior. What are the recommended steps to perform a safe upgrade, including how to back up the current firmware, verify the new image, and test functionality before committing? If the upgrade causes issues, what reliable rollback proce