Hacking Gateway Fastboot problem

[Marverickds]

I think I need some help. I am folowing this tutorial: http://scmods.com/gw_guide/GWFB-1.0.pdf to get fastboot on my old 3ds.

I have just upgraded my 3ds sysnad to 10.3.0-28e wich is the Step 4 of the tutorial. After the upgrade I had to power off the 3ds.

The next step is:
"After the Upgrade is complete, return to this menu again using the same steps to continue the installation"

But when I power my console and open the internet browser, a message appear when I power on wifi "You must update the console in system settings to use the internet browser", so I cant go to go.gateway to keep following the tutorial.

The message, it is a blocking message, with only one button "Accept" that returns me to main menu

Did I miss some step? Any solution/Idea?

Thanks in advance.