ESP8266 Community Forum

Hi there,

maybe somebody is able to help me out.
I got a new nodemcu yesterday and I try to flash the firmware. I was able to do that, was easy. I got the firmware from http://nodemcu-build.com/, I flashed it with Linux and esptool.py
> python ./esptool.py --port .. write_flash 0x000000 <path-to-firmware>
... Output-> Flash params set .... wrote 401408 bytes .... Leaving ...

So far, looks not bad. After that, the blue led is on and when I try to reach the device in a terminal I got every second the following error message (repeating):
Fatal exception (28): epc1=0x40001800, epc2=0x00000000, epc3=0x00000000, excvaddr=0x00007ff0, depc=0x00000000

In case I hit the reset button on the board, the message stop and only some unreadable characters are on the screen. So I try to change the baudrate from 300 up 115200 without any results.

Some Ideas to help me out?

Thanks
Helmut

You probably face 2 potential pitfalls:

1. old init data when upgrading from a 0.9.6 firmware
2. incorrect flash size set for esptool

See Flashing Nodemcu to ESP12 for a comprehensive guide for both.

This article provides step by step guideline on how to flash NodeMCU firmware to ESP8266 models ESP-12 and ESP-12E. It may resolve your issue.

http://www.myelectronicsprojects.com/esp8266-how-to-flash-firmware-esp-12-esp-12e/