user71071: I have flashed an ESP8266 with the ESP8266 flash downloader that said my flashing had succeeded.
But when I sent an AT command from the serial monitor it didn't respond and the TX/RX LED from the ESP8266 didn't respond either. I checked all baudrates from 300-200000, but nothing.
I was using CH340 USB to TTL for flashing wired like this:
USB -> ESP8266
3,3v ->CH_PD and VCC
GND -> GND and GPI0 (only when flashing)
TX -> RX
RX -> TX

I was flashing to downgrade the firmware; the default firmware from shop was SDK 1.5.4, AT VERSION 1.1.0.0.

I have been frustrated with this, because this is my second module.

user71071: SOLVED
My module is esp8266-01S, i need to set the SPI MODE to DOUT, BAUDRATES=115200, SPI SPEED 40MHz and the software is NODEMCU FLASHER.
The important keyword is "DOUT".
I have been flash many times but with not DOUT SPI METHOD. I thought change it will not fix that. I was using QIO SPI MODE but it doesn't work.

71071: <p>I have flashed an ESP8266 with the ESP8266 flash downloader that said my flashing had succeeded.</p>
<p>But when I sent an AT command from the serial monitor it didn't respond and the TX/RX LED from the ESP8266 didn't respond either. I checked all baudrates from 300-200000, but nothing.</p>
<p>I was using CH340 USB to TTL for flashing wired like this:</p>
<pre><code>USB -&gt; ESP8266
3,3v -&gt;CH_PD and VCC
GND -&gt; GND and GPI0 (only when flashing)
TX -&gt; RX
RX -&gt; TX
</code></pre>
<p>I was flashing to downgrade the firmware; the default firmware from shop was SDK 1.5.4, AT VERSION 1.1.0.0.</p>
<p><a href="https://i.stack.imgur.com/juONy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/juONy.jpg" alt="enter image description here" /></a></p>
<p>I have been frustrated with this, because this is my second module.</p>
 71071: <p>SOLVED</p>
<p>My module is esp8266-01S, i need to set the SPI MODE to DOUT, BAUDRATES=115200, SPI SPEED 40MHz and the software is NODEMCU FLASHER.</p>
<p>The important keyword is &quot;DOUT&quot;.</p>
<p>I have been flash many times but with not DOUT SPI METHOD. I thought change it will not fix that. I was using QIO SPI MODE but it doesn't work.</p>
