In this thread [SOLVED] "Failed to disable echo" PROBLEM the Blynk guys stated that firmware version 0.22 is required and that some other later versions might work. There is also a link to the required firmware (and confirmation about setting the baud to 115200).
This instructable gives details of flashing the ESP’s with an Uno http://www.instructables.com/id/Intro-Esp-8266-firmware-update/?ALLSTEPS but I use an FTDI so I can’t confirm it works.