add workaround for tl-wr940
add workaround for tl-wr940

freifunk-bielefeld/firmware-wizard,freifunk-darmstadt/gluon-firmware-wizard,freifunk-darmstadt/gluon-firmware-wizard,freifunk-darmstadt/gluon-firmware-wizard,codedust/gluon-firmware-wizard,freifunk-bielefeld/firmware-wizard,codedust/gluon-firmware-wizard,codedust/gluon-firmware-wizard