Left here for archival purposes.

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By failing
#16709 I have 2 NodeMCU v2 DevKit (from seeed). The firmware it came with worked fine. I updated it to the latest 0.9.5 and tried 0.9.6. The exhibit the following problems:

Once imaged, I cannot create any new files via file.open. The result of any file.open commands are always "nil". On the working NodeMCU (the original firmware) the result for this command is "true".

I have tried the following steps to resolve without any luck.

1) fileformat()
2) Restore an old image 20141219 and then load 0.9.5
3) Blank512k.bin image and then load 0.9.5
4) Tried esptool, and windows flashers.

Additional info:
The devkit image is loaded via "DIO" and 4MB
Last edited by failing on Sun May 24, 2015 6:40 pm, edited 1 time in total.
User avatar
By picxenk
#17155 I'm experiencing same problem. How can I fix it. Please, help us!

I re-flashed NodeMCU v2 with ESP8266Flasher
- 0.9.6 (20150406) integer bin file
- Advanced options
- baudrate : 57600
- Flash size : 4Mbyte
- Flash speed : 40MHz
- SPI mode : DIO
User avatar
By xiaobo
#17357 One solution here:

Our new firmware download tool is in developing.Please use latest flash download tool from espressif.
http://bbs.espressif.com/viewtopic.php?f=5&t=433

Please use DIO mode and 32M flash size option, and flash latest firmware to 0x00000.
Before flashing firmware, please hold FLASH button, and press RST button once.
When our firmware download tool released, it will flash firmware automatically and needn't press any button.


Copy from:
http://www.seeedstudio.com/depot/NodeMC ... 2023914274