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