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Editing Step 4 —

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Edit: the correct temperature is almost 180-200 °C because around the chip there is a little black protection that can go under the chip.

Set a low air flow: 1 or 2 (on a 1 to 7 scale).

Now, doing circular movement, you have to reflow for 4-5 minutes.

Be careful to reflow only the Wi-Fi chip and not any of the surrounding ICs or circuits.

After 5 minutes, gradually decrease the temperature from 200 to 0 °C.

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