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Openai/692da612-aac4-800b-80dd-f1568632e2ff
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=== The onboard LED or its resistor/trace is likely dead. === Wiring external LED (exact): * Pin 13 β 220Ξ© resistor β LED long leg (anode) * LED short leg (cathode) β GND (If you donβt have 220Ξ©, use nearest ~200β470Ξ©) Upload the same Serial+LED test again. If the external LED blinks and Serial prints, your board is usable β just the on-board LED is faulty. You can continue using the external LED or replace the board. If the external LED also does not blink but Serial prints β then pin 13 output path is damaged (rare). Stop and tell me the result.
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