esp8266 esp-01 module [How to restore/flash AT protocol program]

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1

Hello,

I bought esp8266 esp-01 module and it worked, until i tryed to change baud rate. I'm using serial FTDI programmer. When I changed baudrate, I think it was 230400. But it didn't work, I got some wierd stuff on serial. Then i tried changing on my side baud rate and I figured out it swiched to 74880 baud. When I tried to send AT command it didn't respond. Then I found out I can reprogram esp8266 and I started doing stuff... Last thing I did, just uploaded a blank programm. Now esp8266 is working, but it's sending just wierd info:

ets Jan 8 2013,rst cause:4, boot mode:(3,6)

wdt reset
load 0x4010f000, len 1384, room 16
tail 8
chksum 0x2d
csum 0x2d
v4ceabea9
~ld

Is there any way to restore the AT protocol program, that was on when it arieved. (I purched this modue on ebay.)

Please help me.
I apogize for my bad english and low writing skils.

2

this info is bootloader log written at 74880 for chip with 26 MHz oscillator (115200 for 40 MHz). after then the AT firmware starts (if it is there) and uses the baud rate you set with AT command.

to flash the AT firmware download it from espressif.com. on Windows you can flash it with the Flash Download Tool from the same site.

3

Marko15654:
Is there any way to restore the AT protocol program, that was on when it arieved. (I purched this modue on ebay.)

https://www.allaboutcircuits.com/projects/flashing-the-ESP-01-firmware-to-SDK-v2.0.0-is-easier-now/

I should add that I have personally used this procedure and it worked for 3 of my ESP-01.

4

I wrote some instructions for flashing the AT firmware to an ESP8266 here:
https://forum.arduino.cc/index.php?topic=466167.msg3208886#msg3208886
Those are specifically for an ESP8266 WiFi shield but I added some notes about how they can be adapted to any application here:
https://forum.arduino.cc/index.php?topic=466167.msg3208887#msg3208887