Failed to connect to ESP8266

Hey,

I am trying to get Blynk work with my Arduino Uno + ESP8266.
I am following this instructions:

In step 13 I got an error i can not solve…

Console:

JBook:esptool John$ sudo python esptool.py --port /dev/tty.usbmodem1411 write_flash 0x00000 AT22SDK10020150320boot12.bin
Connecting…

A fatal error occurred: Failed to connect to ESP8266

I checked the connection 3 times and tried everything out… including check the 6 steps from nolmath