ESP8266 Community Forum

Don't give up i forgot to mention that i had the same errors.. first time that happened while i was flashing a new firmware, it was around 60% and i tried again than on 40% and that ended up with 0%..

tried and tried... i was sure that my esp died.. I tried windows version of these flashing tools, after tons of trials i succeeded to upload it.

Check the cables, change the cables, change the tool.. probably u'll succeed too.. (Try both 0 low, 2 high or all variations i recommend the standart tool for windows, i guess it was cm.....smthing smting, that has a connection test on it, it'll tell you the true combination of firmware mode:)

Btw after succesfully burning the new firmware i used the pytool as usual without any problems..

I have purchased 4x ESP-12 modules (as nodemcu dev kit) and 2 of them (50%) are not working (one wouldn't connect to the flasher, and flasher complains about invalid header on the other one) .
I decapped one of them just to find bridging on the solder pins on esp8266 chip pad !!
(unfortunately the pins are so small, even with a heat gun and plenty of flux, it will not reflow itself )
I've had good experience with ESP-01 and ESP-03,
these ESP-12 are just bad !!

nonokunono wrote:I have purchased 4x ESP-12 modules (as nodemcu dev kit) and 2 of them (50%) are not working (one wouldn't connect to the flasher, and flasher complains about invalid header on the other one) .
I decapped one of them just to find bridging on the solder pins on esp8266 chip pad !!
(unfortunately the pins are so small, even with a heat gun and plenty of flux, it will not reflow itself )
I've had good experience with ESP-01 and ESP-03,
these ESP-12 are just bad !!

Oh no... Crosspost!
viewtopic.php?f=6&t=442&p=8629#p8629
viewtopic.php?f=13&t=1246&p=8628#p8628

I have the same problem.
Using esp8266_flasher.exe tool I got this:

connecting ....
Erasing flash...پروژه الکترونیک میکروکنترلر ARM AVR LPS STM32 dsPIC 8051 PLC اندروید اردوینو Android Arduino خانه هوشمند کنترل مخابرات شبکه ساختمان لوازم برقی منزل از راه دور ریموت وایرلس WiFi USB Ethernet TCP/IP Bluetooth CAN RS485 مودم GSM GPRS 3G SMS MMS GPS پردازش تصویر ماژول سنسور
Writing at 0x00000000... (0 %)
Invalid head of packet

Now my module is erased and I can't communicate with that.

I've tried this images but got same error:
AI-v0.9.5.0 AT Firmware.bin
espruino_1v72_espruino_1r3_esp8266.bin
espruino_1v73_espruino_1r3_esp8266.bin
nodemcu_20150127.bin

Please help.