Can not get Wifi to work on Aurora with Broadcom BCM4321

Hi all,
I have just installed Aurora 42 on an old silver iMac.

Every thing works out of the box except the wifi : Broadcom BCM4321

I have tried to install the driver with “brew install b43-fwcutter” and reboot

but it did not work.

Then “ujust configure-broadcom-wl” and reboot but it is still the same

Any idea of what I should do ?