But I had the same error with nodemcu on the esp12 , esp01 works perfectly.
But the nodemcu devkey is based on the esp-12. And they succeeded but they won't respond.
I flashed a bin file filled with empty data trying to clear it.
I can build the nodemcu fw, but I also think something is wrong with the offset.
Any ideas how I can find the offsets to flash it ?
Btw are you the sprite_tm from tweakers ?
Thanks