Can only comment on whether use of tHe AF Illuminator on this flash can be turned on in lieu with of the camera's flash Illuminator for the OM DE M5 II?
I have a Metz 50 AF-1 and the flash's AF light doesn't work. It supposedly works with 4/3 cameras, not µ4/3.
The classic DSLR style AF illuminators from the 4/3 system don't work with m4/3 bodies. The only ones that do are the dedicated m4/3 flashes with LED illuminators like the FL-600R, DMW FL-360L, and DMW FL-580L.