New 3ds XL, keeps turning off and showing an error message when arrived to the internet setup section

Hello everyone.

So, i just bought this new 3ds XL and I’m stuck in the initial setup.

Everything go smoothly until i have to setup the internet connection. Then it show’s me an error message and ask to be shut down.

I open the console to check the wifi antena but it seem ok.

I would like to mod it and play some zelda games.

Is there a solution to skip the setup ? Or maybe to mod it directly?

I also tried the thing where you press L, R, up and power, it alow me to go to the internet setting to do an update, but when i connect to my internet box and the update run, it tells me that there is an error and the system will shut down.

Thanks for those who will take time to help me