ESP_RAM_BLOCK = 0x180
ESP_FLASH_BLOCK = 0x40
Tried to flash it with latest nodemcu and it got stuck at 2%..... but I tried it again and lucky me, it worked!
Uploaded the pin lua example and it also worked!
So if anybody has the same problem try changing the esptool.py and flash several times.
However my other two esp8266 esp01 won't flash to 100%. Tried several different .bin files and reaches between 2% - 79%.