Yongnuo Updated YN600EX-RT II Flash not linking with Canon 77D

I think I’ve done everything in the manual and instructional videos I’ve watched, but I can’t seem to get my new Yongnuo YN600EX-RT II flash to link up with my Canon 77D using the Easy Wireless setup. I want to use it as a wireless slave. Optical slave works fine, but the 10-18mm lens casts a shadow from the onboard flash. It also works fine onboard the camera.

I asked on an Amazon product page (I needed it soon!) and someone said it’s compatible, but Yonguo doesn’t list it in the product description. I love the 77D, but it seems like an outlier in Canon’s line.

Any ideas? I don’t want to buy a wireless trigger. This CNET video tells me I’m not misunderstanding the concept!

Here’s the back of the flash:

Back of the Yongnuo flash

And here’s the back of my 77D:

Back of the 77D

Yongnuo YN600EX-RT II Flash Speedlite

I have a typical newbie question. I’ve done HDR for a couple of years now and I see its limitations, so I’m ready to start using flash.

I do real estate photography with the Canon EF-S 10-18mm lens on a 77D. I’m not quite comfortable using manual mode, so I set it on Av with f/6.3. Almost all the homes I shoot are less than 4000 sqft.

I plan to use a flash or two on stands just outside of the frame. I assume I’ll have to use a diffuser because of the ultra-wide angle lens.

I’m thinking about buying this flash. My question is, is this overkill? If not, what would you recommend?

Also, will it work in E-TTL mode using the Canon Easy Wireless system?

Thanks, Bruce

Can one YN600EX-RT II act as a transmitter only for another YN600EX-RT II?

Can a Yongnuo flash YN600EX-RT II mounted on a Canon 5D Mark iv (or any canon camera for that matter), trigger another YN600EX-RT II mounted on another tripod, without triggering its own flash ? (need only the tripod mounted flash to get triggered. This is for a particular situation, and i don’t want to spend money on a stand-alone transmitter only)

Can someone who has 2 of these YN600EX-RT II please check and confirm, before i make the purchase ?

Yonguno YN600EX-RT and Canon T6 High Speed sync issue: Horizontal lighter band in picture

I am able to get HHS working on the Canon T6 with the Yonguno flash, but when I go to 1/4000, ISO 100, and f1.8, the picture comes out with a horizontal band that is lighter than the rest of the picture. I can’t figure out if this is a defect in the flash, where it is pulsing to many times during the curtain sequence, or something with the camera. Using the Yonguno YN-E3-RT as the trigger.

Playing with settings, even at 1/1000, ISO 400 still getting that lighter horizontal band. When regular on board flash is used, no issues.

Any ideas? Could it be a hardware defect, or am I overlooking something?