Just to let you all know that in V4.3, the system file gargoyle_1.5.8-ar71xx-generic-tl-wr741nd-v4-squashfs-factory will not upgrade until you rename it to a TP link router system file. Try renaming it to wr741nv1_en_3_12_4_up(100910)
Am trying out the new Gargoyle 1.5.8 on the version 4.3 and so far all is running well.