FiPy LTE Firmware upgrade fails

[railmonitor]

Hi.

I was following this excellent tutorial: https://core-electronics.com.au/tutorials/pycom-gpy-fipy-cellular-lte-firmware-update.html

But i ran into problems. I downloaded the NB1 firmware, and got the following files in the folder:

I have uploaded the NB1-41019.dup file to my SD card, and uploaded all the relevant files to the lib folder as instructed in the tutorial.

When i run the following code:

>>> import sqnsupgrade
>>> sqnsupgrade.run('/sd/NB1-41019.dup', 921600)

i get following response:

I tried to check my current version, seeing as there was other .dup files, but seems there has never been a upgrade, why i should be able to use he NB1-41019.dup file right?

Has anyone had similar issues?

EDIT: I think i solved it myself. Apparently the guide at Core Electronics is a bit outdated. I was able to do the upgrade, by not using the second argument, so just: