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In many cases it helps to know the version of the firmware being used to provide the needed input to debug an issue. The below command prints the firmware version
root@am335x-evm:~# ifconfig wlan0 down
root@am335x-evm:/usr/share/wl18xx# ifconfig wlan0 up
[ 2077.084115] wlcore: PHY firmware version: Rev 8.2.0.0.245
[ 2077.180632] wlcore: firmware booted (Rev 8.9.0.0.85)