Hi Victor, thanks for your support, next are the data that you asked:
MCUBootUtility 1.4.0
MIMXRT1020EVK
I have followed the next steps:
1) Connect the EVK to a PC (I have tested both possibilities USB-HID and UART).
2) Select the MCU (IMXRT1020) and "Boot device" as "SD Card" on "Target setup" section.
3) Press "Boot Device configuration" to check the SD card info.
4) Check the "Port status", select the correct port and then press "Connect to ROM" and wait until the led turns blue.
The last step fail, the led turn green and the cmd window show the message that I have posted.
I have tried using sdphost and blhost tools directly, and those seems to work, I mean I can download an image to an SD card.
So, I think maybe this issue have something to do with python version (2.7).