wifi problem with Dell xps13 9350

[allegro-vivo]

hi,
I've a new laptop Dell with SparkyLinux 4.1 installed (kernel 4.1, openbox).
I cannot connect wireless.

What I've tryed:

1. thanks to https://wiki.debian.org/InstallingDebianOn/Dell/Dell%20XPS%2013%209343 I installed broadcom-sta-source. By clicking at the network-manager icon I could not find any wifi.

2. than I typed in Terminal

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lspci -nn -n 14e4:
in order to see that the Network Controller is a Broadcom BCN4352 [14e4:43b1]; thanks to https://wiki.debian.org/wl I removed broadcom-sta-source and installed broadcom-sta-dkms; then from Terminal:

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sudo modprobe -r b44 b43 b43legacy ssb brcmsmac
sudo modprobe wl
now the laptop finds the connection, it seems to connect but... no! it doesn't conect.

any help?

PS: from my Desktop-Computer the connection was possible