Check your files under /etc/modprobe.d to make sure one of the files contains an entry to blacklist bcma like you originally intended and reboot.
Also, make sure your wireless adapter isn’t being soft blocked with sudo rfkill unblock all . If your system has a hardware switch to block the wireless adapter, make sure that is unblocked too.
If still no luck, sudo dmesg and sudo journalctl -xe to see if there is indicating why,