Update README

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lewishe 2023-03-06 15:57:40 +08:00
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[Flash_download_tool](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.3_0.zip)
When you suspect that there is a problem with the hardware, you can brush in our test firmware
1. Download [Flash_download_tool](https://www.espressif.com.cn/sites/default/files/tools/flash_download_tool_3.9.3_0.zip)
2. Select esp32,UART
![](esp32-1.png)
3. Select according to the following figure, finally select START, press RST after writing, or power on again, and then observe the log output from the serial port
![](esp32-2.png)