root@DietPi:~# modprobe -r brcmfmac
root@DietPi:~# modprobe brcmfmac
root@DietPi:~# dmesg | grep mmc1
[3.401335] mmc1: error -110 whilst initialising SDIO card
root@DietPi:~# ls -al /lib/firmware/brcm | grep brcmfmac
-rw-r--r-- 1 root root 1121 Jan 14 20:35 brcmfmac43430-sdio.txt
-rw-r--r-- 1 root root 382455 Jan 14 20:35 brcmfmac43430a0-sdio.bin
Think I have a duff board 
https://forums.raspberrypi.com/viewtopic.php?t=138629&start=50