Can see wifi network, but can't connect

Hey all,

I've just replaced the Lenovo firmware on my T400 with libreboot. During this process, I've also replaced the laptop's wifi chip with an Atheros AR9285 chipset.

It seems to me, like the new wifi chip is also recognized as

$ lspci

gives

$ ...
$ 02:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
$ ...

However, despite seeing different wifi networks, I can't connect to any of them (tried with two different ones).

Could you provide me with some help on this? Will gladly provide any info you need.

Thanks in advance.