| Red Flag | Green Flag | |----------|-------------| | File size > 20MB (bloated with adware) | File size ~4.8MB | | Requires “installer booster” | Direct single-click download | | No digital signature | Signed by “Write AT Project” |
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This occurs when another background program or serial monitor (like the Arduino IDE Serial Monitor) is utilizing the port. Close all alternative terminal tools and re-attempt the connection profile.