# Can't successfully flash the ESP8266 AT Firmware on my ESP8266 WiFi Module connected to Arduino **URL:** \ **Category:** IDE 1.x\ **Created:** [May 3, 2022, 11:20am UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833 "2022-05-03T11:20:41Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![charvin123](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/charvin123/32/728917_2.png) [@charvin123](https://forum.arduino.cc/u/charvin123)\ **Post date:** [May 3, 2022, 11:20am UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/1 "2022-05-03T11:20:41Z")
![image](https://europe1.discourse-cdn.com/arduino/original/4X/7/b/3/7b35ce9cb4332024e147aec89839ab401f7f5747.png) The tool just display . . . . \_\_\_\_\_\_\_ . . . . it doesn't complete the flash. What could be wrong? Connected the ESP8266 WiFi Module to Arduino Mega 2560 ESP8266 Mega 2560 3v3 ----\> 3.3 V GND ----\> GND GPIO ----\> GND RX ----\> 1 (TX0) TX ----\> 2 (RX0) ---
**Author:** ![Juraj](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/juraj/32/238785_2.png) [@Juraj](https://forum.arduino.cc/u/Juraj)\ **Post date:** [May 3, 2022, 12:09pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/2 "2022-05-03T12:09:49Z")
what esp8266 module? ---
**Author:** ![charvin123](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/charvin123/32/728917_2.png) [@charvin123](https://forum.arduino.cc/u/charvin123)\ **Post date:** [May 3, 2022, 5:21pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/3 "2022-05-03T17:21:19Z")
![wifi module](https://europe1.discourse-cdn.com/arduino/original/4X/d/5/7/d5756a7e570a721f49d9a6b6790272bcba36673b.jpeg) This one i bought in online shop. ---
**Author:** ![charvin123](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/charvin123/32/728917_2.png) [@charvin123](https://forum.arduino.cc/u/charvin123)\ **Post date:** [May 3, 2022, 5:23pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/4 "2022-05-03T17:23:49Z")
Does it also needed for the ESP8266 to blink if it's successfully connected? The blue LED only blink for a second when I connect the GND and 3.3V pin of the wifi module, then the LED don't blink again. ---
**Author:** ![Juraj](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/juraj/32/238785_2.png) [@Juraj](https://forum.arduino.cc/u/Juraj)\ **Post date:** [May 3, 2022, 5:31pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/5 "2022-05-03T17:31:56Z")
wire RX to RX and TX to TX to connect esp-01 to USB chip RX to TX (because those are RX and TX of the ATmega wired to USB chip RX to TX) ---
**Author:** ![charvin123](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/charvin123/32/728917_2.png) [@charvin123](https://forum.arduino.cc/u/charvin123)\ **Post date:** [May 4, 2022, 2:12pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/6 "2022-05-04T14:12:15Z")
![image](https://europe1.discourse-cdn.com/arduino/original/4X/1/4/c/14cb9db87f8e075e4e03fa73d9c30bbd7fb85bf5.png) I tried connecting TX of ESP8266 to TX of Mega and RX of ESP8266 and RX of Mega, still doesn't work. I also tried switching to the pins to different rx tx pins and digital pins of Mega, and switching to 4Mbit flash size, but still doesn't work. Sometimes it would get endless . . . . . . \_\_\_\_\_\_\_\_ . . . . . . or this one: ![image](https://europe1.discourse-cdn.com/arduino/original/4X/b/7/e/b7e2cb90810dc4ec618b28f6938802cbf0509f57.png) ---
**Author:** ![charvin123](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/charvin123/32/728917_2.png) [@charvin123](https://forum.arduino.cc/u/charvin123)\ **Post date:** [May 4, 2022, 2:20pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/7 "2022-05-04T14:20:52Z")
![image](https://europe1.discourse-cdn.com/arduino/original/4X/b/1/2/b12b379d57e3d482a096f802ed5a677fccb65c5f.png) I tried another flashing tool I found on youtube, it does work, but I don't know if its official and valid. ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [October 31, 2022, 2:21pm UTC](https://forum.arduino.cc/t/cant-successfully-flash-the-esp8266-at-firmware-on-my-esp8266-wifi-module-connected-to-arduino/987833/8 "2022-10-31T14:21:44Z")
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