Comment 6 for bug 1834749

Can anyone experiencing this bug try running:

$apt list -a firmware-brcm80211

to see if the version installed is firmware-brcm80211 1:20190114-1+rpt5

I was able to solve an issue similar to this (or the same?) by downgrading this package to firmware-brcm80211 1:20190114-1+rpt4. You can see more about my problem on Stack Exchange here:

https://raspberrypi.stackexchange.com/questions/110786/rpi4-with-buster-wpa-supplicant-fails-to-connect-to-hostapd-network-hosted-on-ub/110796?noredirect=1#comment189464_110796