Fenvi 1200M only connecting to some Wifi networks

As in title:

I have a Fenvi 1200M and everything is recognised OOB. Bluetooth works perfectly.

The Wifi can only connect to some networks, however. It connects fine to my main Virgin router, but with the secondary router (closer to my computer, same network connected to Virgin router by ethernet, different SSID) it either gets an error when connecting or connects with no IP address. It also cannot connect to my iPhone hotspot.

System profiler reports the card as:

AirPort Extreme (0x14E4, 0x117)

Broadcom BCM43xx 1.0 (7.77.111.1 AirPortDriverBrcmNIC-1615.1)

Wifi works fine in Windows and connects to all Wifi networks normally.

I have tried changing PCI slot.

I haven't tried any kexts.

Any advice would be great :)