Problem about WIFI scan

[Heltec-Aaron-Lee]

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Hardware:

Board: ESP-32S Module
Core Installation/update date: 30/Oct/2017
IDE name: Arduino IDE
Flash Frequency: 80Mhz
Upload Speed: 115200

Description:

When we test the WIFI scan examples, no network can be found. we tested with many boards or modules.

Sketch:

//Change the code below by your sketch
#include <Arduino.h>

void setup() {
}

void loop() {
}

Debug Messages:

Enable Core debug level: Debug on tools menu of Arduino IDE, then put the serial output here 

[beegee-tokyo]

Check #758 for a solution.