I’m on a 2009 mbp with identical wifi hardware working fine:
Device-2: Broadcom BCM4322 802.11a/b/g/n Wireless LAN
driver: b43-pci-bridge
IF-ID-1: wlan0 state: up mac: <filter>
The problem is your:
wlan0 state: down
Might be a kernel issue, I’m on 5.10 LTS, check this post: MacBook Pro won't detect or connect to WIFI (BCM4322) - #3 by nulinuxbee