HOWTO install a Brother MFC-9340CDW on Debian 9/Stretch

Download their driver install tool “linux-brprinter-installer-2.1.1-1.gz”

gunzip linux-brprinter-installer-*.*.*-*.gz

sudo bash linux-brprinter-installer-2.1.1-1 MFC-9340CDW

brsaneconfig4 -a name=BroScan model=MFC-9340CDW ip=xx.xx.xx.xx

Printer and Scanner should now work